I have a sheet in which I have a dropdown that I want users to be able to select a value from. Is it possible to add a value from another cell to the dropdown number after they select from the dropdown? Aka a user selects 3, and the cell displays the number 3+X, where X is a value in another cell. Thank you in advance!

I have a sheet in which I have a dropdown that I want users to be able to select a value from. Is it possible to add a value from another cell to the dropdown number after they select from the dropdown? Aka a user selects 3, and the cell displays the number 3+X, where X is a value in another cell.