get variable value from Text with Alias in PDM

Hello,

I am looking to either add or not add a variable value to my description in PDM. I tried using a Text with Alias list, so that if you select to add the variable as "yes" then the description will add the variable value, and "no" will add nothing. Is there a way to call out the variable in the list so that the edit boxes in the PDM data card show the variable value? I thought it may be something to do with the % character placed by the variable, but no luck. Any tips would sure help. Thanks!