On Celtx I actually have two smallish scripts this year, one's a screenplay and one's a stageplay.... I was just wondering if there was a way to combine them that wouldn't result in making it all rather strange. o-o;; I can also just copy+paste, so it's not a huge thing-- I was just wondering.

There's no way that I'm aware of to combine PDFs; you have to create a new file, and create a new PDF from scratch.

Please review this topic for more tips:
http://www.scriptfrenzy.org/eng/node/3160177