choose from a dropdown menu but display another in the cell

Ok so heres my problem ive created a worksheet with a drop down list of choices (which are times) but when certain times are selected i want it to display "cl" but any formula which proces the cell to process the time, i do not know if this is possible but any help would be great!

Welcome to the Board, however, note:

Your post does not comply with Rule 1 of our Forum RULES.

Your post title should accurately and concisely describe your problem, not your anticipated solution. Use terms appropriate to a Google search.
Poor thread titles, like Please Help, Urgent, Need Help, Formula Problem, Code Problem, and Need Advice will be addressed according to the OP's experience in the forum:
If you have less than 10 posts, expect (and respond to) a request to change your thread title.
If you have 10 or more posts, expect your post to be locked, so you can start a new thread with an appropriate title.

To change a Title on your post, click EDIT on your First Post, Go Advanced and change your title, if 2 days have passed ask a moderator to do it for you.