Advice anyone? thanks

I'm about to repot a very prolific green dragon (+50 traps and still in the original green pot). There are 2 older plants and 2 new plants growing fairly close to each other. Is it safe to break the plants up and transplant some of them when I repot? Or are the root structures to intermeshed to do that without killing the whole thing off? Could I just excise the smaller plants from the top, without disturbing the soil?

also, can you actually cut a bulb in half and have them both regrow? I'd probably need some fungicide or something right?