Not quite clear, what you want to do. val("%") equal 0.
If the variable should contain a NUMBER in percentage, then you cannot "append" a character to it. If the variable should contain a string, then:

store trans(cmscomp.percent)+"%" to lccomplist

>I would like to append the % sign to a variable. My syntax reads:
>
>

>store cmscomp.percent+val("%") to lccomplist
>

>
>But this comes out like 90.00 instead of reading 90.0%
>
>How can I achieve this?