I have a fairly large spreadsheet in which I have protected certain cells from being accidentially modified by the user by setting Data -> Validation -> Custom -> =. I have found that it would be much more beneficial if I could instead have a pop-up box when a user tried to modify a certain cell, asking for verification before allowing them to modify the cell. Is there a way to specify certain cells to call a pop-up box when a user tries to modify them?
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