There's many freebies online for reason refill. I've downloaded all mine and have them stored on a spare hard drive. I personally use reason in Sonar 8 producer ed. Two ways I go about using it. Firstly getting midi from a biab file. How I get my midi is to save each midi track separately in biab. For example, piano, strings, bass etc... Taking note of the tempo is of course advisable, then just type in the same tempo into reason.
Re-open using sonar and import the required midi into reason. Select the synth you wish to use and tweak to your hearts content.
Adding refill is no problem, just open the folder containing your refills & drag them into the reason folder. Hundreds of free refills to suit every taste on the propellorhead website, export each midi file as a wav and Bob's your uncle or Aunt