Hi, probably a simple one but it has me stumped!

I have a var called %level

I am wondering how would I go about setting multiple strings in the var, so it would hold 1, and 2 and could be searched for example:

if (%user_level isin %level) /dosomething

I realise I could just manually write %level 1, 2, etc but I want some kind of command which will alow me to add a string to the end of the var.

Thanks!