Below are two types: a list of items that pulldown from within the cell that gets the data and be able to add your own item, that is not on the pulldown-dropdown list, then:
To the right of your sheet build a list one item per row in one column. Click the column ID to highlight the column, then use:
Insert-Name-Define then name your list.
Click the cell you want the list in, then:
Data-Validation-Settings (select "List" from Allow) in "Source" add =your list name, Like: =myList
Then copy the cell you just put the dropdown list in and highlight the other cells you want the list in and hit special paste-validation.
Now when a cell with your dropdown is selected, it grows a dropdown arrow, which when clicked returns your selection list.
To limit the selection to only the values in your list:
Data-validation-Settings
Allow: List
Check: Ignore blank
Check: In-Cell dropdown
Source: =$AA:$AA (this is the column "myList" is in.
Then:
Tab to Error Alert
Check: Show
Style: Stop
Title: Error!
Error Message: Only select from the dropdown list!
Now the user can put a wrong entery in the cell but they cannot move from the cell without an Error Box Message and the options to fix or erase their entery or start over. JSW