Hello @MarkS34 ,
When you say "selection box" are you referring to where you'd select lists when scheduling an email? You shouldn't need to really paste anything, especially since tags don't function like lists. You can select a list, and narrow by tag (i.e. include or exclude the tag from targeted recipients), is that what you're looking to do? You'll also want to make sure you have lists, not segments selected when looking for options to send an email to.