Is it possible to "chop and screw" the music/lyrics I have on reason?
Also, how can I sample from a song already created?

Thank you in advance

What do you mean by "chop and screw"?

There are many ways to go about this. I usually use a Cool Edit (Adobe Audition) and cut the pieces I need. If it's a straight bar (e.g. a beat) then I'd also use a Recycle and make a Dr. REX loop out of it for ease of use later on.

I use mix vibes pro to screw and chop. I also use an old version that is real easy to use. The newer one gets real complicated as it's loaded with features.