*The tutorial shows how to create an Excel drop down list depending on another cell by using new dynamic array functions.*

Creating a simple drop down list in Excel is easy. Making a multi-level cascading drop-down has always been a challenge. The above linked tutorial describes four different approaches, each including a crazy number of steps, a bunch of different formulas, and a handful of limitations relating to multi-word entries, blank cells, etc.

That was the bad news. The good news is that those methods were designed for pre-dynamic versions of Excel. The introduction of dynamic arrays in Excel 365 has changed everything! With new dynamic array functions, creating a multiple dependent drop-down list is a matter of minutes, if not seconds. No tricks, no caveats, no nonsense. Only fast, straightforward and easy-to-follow solutions.

Notes:

- This new dynamic array way of making dropdown lists only works in Excel 365 and Excel 2021. In pre-dynamic Excel, you will have to do it the long old-fashioned way as described in Creating a dependent drop down in Excel 2019, 2016 and earlier.
- This solution is for a single row. If you want to copy your picklists down
**multiple rows**, then follow the instructions in Dependent drop-down list for multiple rows.

This example demonstrates the general approach to creating a cascading drop down list in Excel by using the new dynamic array functions.

Supposing you have a list of fruit in column A and exporters in column B. An additional complication is that the fruit names are not grouped but scattered across the column. The goal is to put the unique fruit names in the first drop-down and depending on the user's selection show the relevant exporters in the second drop-down.

To create a dynamic dependent drop down list in Excel, carry out these steps:

For starters, we shall extract all different fruit names from column A. This can be done by using the UNIQUE function in its simplest form - supply the fruit list for the first argument (*array*) and omit the remaining optional arguments as their defaults work just fine for us:

`=UNIQUE(A3:A15)`

The formula goes to G3, and after pressing the Enter key the results spill into the next cells automatically.

To make your primary drop-down list, configure an Excel Data Validation rule in this way:

- Select a cell in which you want the dropdown to appear (D3 in our case).
- On the
*Data*tab, in the*Data Tools*group, click**Data Validation**. - In the
*Data Validation*dialog box, do the following:- Under
*Allow*, select**List**. - In the
*Source*box, enter the reference to the spill range output by the UNIQUE formula. For this, type the hash tag right after the cell reference, like this: =$G$3#This is called a spill range reference, and this syntax refers to the entire range regardless of how much it expands or contracts.

- Click
*OK*to close the dialog.

- Under

Your primary drop-down list is done!

To get entries for the secondary dropdown menu, we'll filter the values in column B based on the value selected in the first dropdown. This can be done with the help of another dynamic array function called FILTER:

`=FILTER(B3:B15, A3:A15=D3)`

Where B3:B15 are the source data for your dependent drop down, A3:A15 are the source data for your main dropdown, and D3 is the main dropdown cell.

To make sure the formula works correctly, you can select some value in the first drop-down list and observe the results returned by FILTER. Perfect! :)

To create the second dropdown list, configure the data validation criteria exactly as you did for the first drop down at step 2. But this time, reference the spill range returned by the FILTER function: =$H$3#

That's it! Your Excel dependent dropdown list is ready for use.

Tips and notes:

- To have the
**new entries included**in the drop-down list**automatically**, format your source data as an Excel table. Or you can include a few blank cells in your formulas as demonstrated in this example. - If your original data contains any gaps, you can
**filter out blanks**by using this solution. - To
**alphabetically sort**a dropdown's items, wrap your formulas in the SORT function as explained in this example.

In the previous example, we made a drop down list depending on another cell. But what if you need a multi-level hierarchy, i.e. a 3^{rd} dropdown depending in the 2^{nd} list, or even a 4^{th} dropdown depending on the 3^{rd} list. Is that possible? Yes, you can set up any number of dependent lists (a reasonable number, of course :).

For this example, we have placed states / provinces in column C, and are now looking to add a corresponding dropdown menu in G3:

To make a multiple dependent drop down list in Excel, this is what you need to do:

The main dropdown list is created with exact the same steps as in the previous example (please see steps 1 and 2 above). The only difference is the spill range reference you enter in the *Source* box.

This time, the UNIQUE formula is in E8, and the main drop down list is going to be in E3. So, you select E3, click *Data Validation*, and supply this reference: =$E$8#

As you may have noticed, now column B contains multiple occurrences of the same exporters. But you want only unique names in your dropdown list, right? To leave out all duplicate occurrences, wrap the UNIQUE function around your FILTER formula, and enter this updated formula in F8:

`=UNIQUE(FILTER(B3:B15, A3:A15=E3))`

Where B3:B15 are the source data for the second drop down, A3:A15 are the source data for the first dropdown, and E3 is the first dropdown cell.

After that, use the following spill range reference for the Data Validation criteria: =$F$8#

To gather the items for the 3^{rd} drop down list, make use of the FILTER formula with multiple criteria. The first criterion checks the entire fruit list against the value selected in the 1^{st} dropdown (A3:A15=E3) while the second criterion tests the list of exporters against the selection in the 2^{nd} dropdown (B3:B15=F3). The complete formula goes to G8:

`=FILTER(C3:C15, (A3:A15=E3) * (B3:B15=F3))`

If you are going to add more dependent dropdowns (4^{th}, 5^{th}, etc.), then most likely column C will contain multiple occurrences of the same item. To prevent duplicates from getting into the preparation table, and consequently in the 3rd dropdown, nest the FILTER formula in the UNIQUE function like we did in the previous step:

`=UNIQUE(FILTER(C3:C15, (A3:A15=E3) * (B3:B15=F3)))`

The last thing for you to do is to create one more Data Validation rule with this *Source* reference: =$G$8#

Your multiple dependent drop down list is good to go!

Tip. In a similar manner, you can get items for **subsequent drop-downs**. Assuming column D contains the source data for your 4^{th} dropdown list, you can enter the following formula in H8 to retrieve the corresponding items:

`=UNIQUE(FILTER(D3:D15, (A3:A15=E3) * (B3:B15=F3) * (C3:C15=G3)))`

After creating a dropdown, your first concern may be as to what happens when you add new items to the source data. Will the dropdown list update automatically? If your original data is formatted as Excel table, then yes, a dynamic drop down list discussed in the previous examples will expand automatically without any effort on your side because Excel tables are expandable by their nature.

If for some reason using an Excel table is not an option, you can make your dropdown list expandable in this way:

- To
**include new data**automatically as it is added to the source list, add a few extra cells to the arrays referenced in your formulas. - To
**exclude blank cells**, configure the formulas to ignore empty cells until they get filled.

Keeping these two points in mind, let's fine-tune the formulas in our data preparation table. The Data Validation rules do not require any adjustments at all.

With the fruit names in A3:A15, we add 5 extra cells to the array to cater for possible new entries. Additionally, we embed the FILTER function into UNIQUE to extract unique values without blanks.

Given the above, the formula in G3 takes this shape:

`=UNIQUE(FILTER(A3:A20, A3:A20<>""))`

The formula in G3 does not need much tweaking - just extend the arrays with a few more cells:

`=FILTER(B3:B20, A3:A20=D3)`

The result is a fully dynamic expandable dependent drop down list:

Want to arrange your dropdown list alphabetically without resorting the source data? The new dynamic Excel has a special function for this too! In your data preparation table, simply wrap the SORT function around your existing formulas.

The data validation rules are configured exactly as described in the previous examples.

Since the ascending sort order is the default option, you can just nest your existing formulas in the *array* argument of SORT, omitting all other arguments which are optional.

For the **main dropdown **(the formula in G3):

`=SORT(UNIQUE(FILTER(A3:A20, A3:A20<>"")))`

For the **dependent dropdown **(the formula in H3):

`=SORT(FILTER(B3:B20, A3:A20=D3))`

Done! Both drop down lists get sorted alphabetically A to Z.

To sort in descending order, you need to set the 3^{rd} argument (*sort_order*) of the SORT function to -1.

For the **main dropdown **(the formula in G3):

`=SORT(UNIQUE(FILTER(A3:A20, A3:A20<>"")), 1, -1)`

For the **dependent dropdown **(the formula in H3):

`=SORT(FILTER(B3:B20, A3:A20=D3), 1, -1)`

This will sort both the data in the preparation table and the items in the dropdown lists from Z to A:

That's how to create dynamic drop down list in Excel with the help of the new dynamic array functions. Unlike the traditional methods, this approach works perfectly for single and multi-word entries and takes care of any blank cells. Thank you for reading and hope to see you on our blog next week!

Excel dependent drop down list (.xlsx file)

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