I was looking for a way to show a code description when choosing from
multiple values in a single cell.

Example

I have these codes and their definitions in a spreadsheet
A - Architecture
C - Civil
E - Electrical

I only see the following below to choose from in my list which might
not be a big help for some people.
A
B
C

I only want to see A show up in the cell but I would like to see "A -
Architecture" show up in the drop down list.

Can this be done?

Thanks