As far as I know, the Epcot to TTC line is not currently running so you would need to take a bus from Epcot to Poly. If it is running when you go, then you would take the Epcot to TTC monorail like and then either walk to Poly or switch to the resort line.
To get from Poly to CBR using WDW transportation, you would need to transfer via an open theme park or DS.