Seperate billing for different linodes.

I have recently setup a linode for a customer who insisted on paying for it directly, so we set him up a linode account, and created an account giving me access to admin the server.

I have been very happy with the VPS and would like to transfer some of my existing servers to linode.

Question: If I try to create a new linode under my existing login, can I have it billed to me (thus having different linodes billed to different credit cards), or do I need to create a different login account to the linode website to have the bill on a seperate credit card?