Michael, can you tell us more of what you mean by this?

Currently in the Admin Portal, you can only add one person as a billing contact in the billing section. How do I add another person to the account as a billing contact?

You can only add one contact for billing, and the only option is to edit the information on it. Create a Feature Request for this in our Ideas portal, and paste the link here so others can also vote.
www.ideas.ringcentral.com

Would you also please mark this as accepted if I answered your question? Thank you!