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How to hide previously used items in dropdown list?

In Excel, you can quickly create a normal dropdown list, but have you ever tried to make a dropdown list when you choose one item, the previously used one will be removed from the list? For example, if I have a dropdown list with 100 names, as I select a name, I want to delete this name from the drop down list, and now the dropdown contains 99 names, and so on until the drop down list is empty. Maybe, this is some difficult for most of us, and here, I can talk about how to create such a drop down list in Excel.

Hide previously used items in drop down list with helper columns


arrow blue right bubble Hide previously used items in drop down list with helper columns

Supposing you have a list of names in Column A as following screenshot shown, then follow the below steps one by one to finish this task.

doc-hide-used-items-dropdown-list-1

1. Besides your name list, please enter this formula =IF(COUNTIF($F$1:$F$11,A1)>=1,"",ROW()) into cell B1, see screenshot:

doc-hide-used-items-dropdown-list-1

Note: In the above formula, F1:F11is the cell range that you want to put the drop down list, and A1 is your name cell.

2. Then drag the fill handle over to the range that contain this formula, and you will get the following result:

doc-hide-used-items-dropdown-list-1

3. And go on applying a formula in Column C, please type this formula: =IF(ROW(A1)-ROW(A$1)+1>COUNT(B$1:B$11),"",INDEX(A:A,SMALL(B$1:B$11,1+ROW(A1)-ROW(A$1)))) into cell C1, see screenshot:

doc-hide-used-items-dropdown-list-1

4. Then fill this formula down to the range you need, see screenshot:

doc-hide-used-items-dropdown-list-1

5. Now you need to define a range name for these names in Column C, select C1:C11 (the range you apply formula in step 4), and then click Formulas > Define Name, see screenshot:

doc-hide-used-items-dropdown-list-1

6. In the New Name dialog box, type a name in the Name text box, and then enter this formula =OFFSET(Sheet2!$C$1,0,0,COUNTA(Sheet2!$C$1:$C$11)-COUNTBLANK(Sheet2!$C$1:$C$11),1) into the Refers to field, see screenshot:

doc-hide-used-items-dropdown-list-1

Note: In the above formula, C1:C11 is the helper column range that you have created in Step 3, and the Sheet 2 is the current sheet you are using.

7. After finishing the settings, then you can create a drop down list, select cell F1: F11 where you want to put the drop down list, then click Data > Data Validation > Data Validation, see screenshot:

doc-hide-used-items-dropdown-list-1

8. In the Data Validation dialog box, click Settings tab, then choose List from the Allow drop down list, and then under Source section, enter this formula: =namecheck, (namecheck is the range name you are created in Step 6), see screenshot:

doc-hide-used-items-dropdown-list-1

9. And then click OK button to close this dialog, now, the drop down list have been created in the selected range, and after selecting one name from the drop down, this used name will be removed from the list and it only shows the names that have not been used, see screenshot:

doc-hide-used-items-dropdown-list-1

Tip: You cannot remove the helper columns you make in above steps, if you remove them, the drop down list will be invalid.


Related articles:

How to insert drop down list in Excel?

How to quickly create dynamic drop down list in Excel?

How to create drop down list with images in Excel?

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Comments (19)
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This comment was minimized by the moderator on the site
Does any one know how to get the formula to reset itself once all the items on the list are selected?
e.g.
List 1, 2, 3, 4 - Then after selecting 1, List 2, 3, 4 - Then after Selecting 2, List 3, 4 - Then after selecting 3, List 4 and last, after selecting 4, list empty. How can this be reset so that after you select 4, all the items in the list reset to original list? So, after selecting 4, instead of List being empty, for list to go back to List 1, 2, 3, 4.

Thank you
This comment was minimized by the moderator on the site
This worked like a charm ... expect I need to have this "repeat" in three places on the same spreadsheet. I can't make it function properly, the second time. The items from the first drop down list are eliminated but when an entry is selected in the second location, it isn't removed from the list. Any idea on how to may this function properly?
KL
This comment was minimized by the moderator on the site
Can this formula be used successfully across multiple columns on one spreadsheet? I'm trying to have three columns where someone can select up to three items from a drop down list, i.e. item 1 in column 3, items2 in column 4, and item 3 in column 5. I can get the formula to work at the first occurrence, however, the second time I try to copy the formula, the selection(s) don't disappear from the drop down list, as they do in the column of the first occurrence.
This comment was minimized by the moderator on the site
Bravo! Fantastic solution! I have my workbook set up such that the items in my list are in a separate worksheet that I'm index-matching to through my number and helper columns leaving only them two on my calculation page. Again, very clean solution, Programmer!
This comment was minimized by the moderator on the site
Step 6 isn't working for me. I keep getting an error message saying the syntax of this name isn't correct... Can anyone help?
This comment was minimized by the moderator on the site
Is there a way to have only some of the options get removed when selected and others be permanent?
This comment was minimized by the moderator on the site
How do I get this activity to work if I transpose from Row to Column
This comment was minimized by the moderator on the site
I’ve entered all the formulas correctly, but the only name showing up is the first one on the list. What am I doing wrong??
This comment was minimized by the moderator on the site
Works great, however, if you have two people on the list with the same name e.g. John Smith it removes both incidents of 'John Smith' from the list when you select one of them.


Is there a way to amend this so that you have have multiple versions of the one name without them all being removed?


Thanks.
This comment was minimized by the moderator on the site
How would you change this formula for use of data validation list across multiple rows instead of a single column. Is that possible? Thanks
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