Not sure I understand the question.
It's one code per transfer, but you can do it multiple times. You can move from Bank to Home, but never back the other way.
Bank is free for a month, and Home costs like $5 for a month.
Ok great, yeah I was wondering if I could get another code to do multiple transfers. I'm only transferring a few Pokemon right now just to familiarize myself with the service.
Not willing to transfer my collection yet, especially since most of them will just be sitting there unable to be used.