Conditional Build Tags for Framesets Using RH6

I am using RoboHelp 6. I have conditional build tags on some topics within a folder and also on certain entire folders and these are working nicely. In addition, however, I really would like to add conditional build tags to two framesets in order to separate this information so that each frameset is seen only by the appropriate groups (just as it is in the regular topics/folders). I am reluctant to even try to do so because if this is something that RH6 doesn't allow I don't want to do something that will corrupt my project. If adding conditional build tags is possible, then I need to know where I add them: 1) to the frameset, or 2) to each of the two topics that make up the frameset, or 3) a combination of the frameset and the two topics.