Finally, an easy question!
From CBR, take a Magic Kingdom bus. After you get off the bus at MK, before you get to the park's main entrance you will see signs for the resort monorail. Get on the monorail and take it to the Poly.
There is also a boat that goes from outside Mk straight to the Poly, I believe.
In either case, the ONLY good way to get to Poly from CBR will start with a bus ride to MK. Unless of course you want to take a cab, but I would recommend that that's not neceesary.