Splitting files for red multicam edit

On five Red Epics we filmed three times a choir/orchestra piece. Each time the cameras were kept running for two performances back to back. (So that gives me six performances of the piece.) Even though it won't sync perfectly, I'd like to put all of it in the multicam, which is 30 angles of the one piece and then fine tune the sync for the pieces I do use. I have a couple of questions.

First, how do I split the takes in half (since there were two performances on each take) and still keep all the red data intact (for later color correction).

Second, it looks like it is possible to edit the multicam to cut out parts of the take that aren't needed, like when the camera was resetting. Rights?

I'd just appreciate any thoughts anyone might have about this as we try to tackle a complex project.