Copying levels together?

So I've been seriously considering starting up a large-ish Knytt world which would mainly be me combining several of my old started projects into one large one, revamping the story line so they all fit, and working from there.  Question is, has anyone developed a tool for copying all the screens from one level and dumping them into another?  It would not need to be fancy, just effective.  Thanks.

I believe KS Level Composer is the tool you need for this. I've never used it for this purpose, but it seems many KS authors agree that it's a great tool for combining multiple levels.

Very nice!  Thank you!  I'll give it a go!