Select from list then populate nearby cell? Possible?

I am trying to create a rating scale and in it I have a list of criteria. There are 5 items to choose from and I have a drop-down list to select an "X" for criteria that are met. I want the items to be able to be selected and then a score be designated to a nearby box. ALSO, I want the score to only count for one of those items... for instance...

Cell B64 is Successful TA. Cell C64 would be marked with the X from the drop down. Cell E64 would then convert from a blank to a 3.

Then say I go down to B65 (Demonstrated Leadership). Cell B65 would be marked with an X from drop down. Cell E65 would remain blank if E64 had 3 in it.

This would go on for E64 to E68 so that if any of them are given points, the others turn blank automatically.

Not sure if this is possible, but I know a LOT can be done on Excel. Thanks ahead of time!

Post a workbook and explain in context.

Here is an example workbook.

The items on the left are the criteria. I would like to be able to select the box next to it (shown with an X) and have the points received cell populate automatically with a 2. BUT, I only want ONE of those criterion to count towards the final score... SO, if more than one cell from Column C is marked, I only want ONE of the cells in column E showing 2 points.

Does that help?Bonus Points.xlsx

I would not use drop-downs in that case, but custom validation.

In column D, use a data validation with the custom formula

=D11="X"

in F2 use a custom data validation with the formula

=AND(OR(F11=0,F11=2),SUM($F$11:$F$15)<=2)

Copy both cells down.

Sorry, I have been away from the Forum. I am trying your suggestions, but have been unsuccessful. Could you post the workbook again with the suggestions made?