how do i import beats from youtube or anything else on to my persons studio one 2 artist using mac computer?

You'll need to use an aggregate audio driver to combine multiple different audio sources and/or hardware devices in that way, recording YouTube or Soundcloud audio while at the same time recording from a live microphone, etc, etc.

Mac OS has a built in facility for aggregating audio devices. On Windows the most common path is to use ASIO4ALL for that.