Upload CBSubs Users and Billing Information

Is it possible to upload users and their billing information for subscription plans? If so, how can this best be accomplished.

Current Gateway: Authorize.net

Upload users and their billing information to where? Please be more specific as to what you're wanting to do. Users are edited within user management. CB has no use import feature, for this you'd need to use CB Juice.

Sorry, I should have been more clear. I need to import subscription users into CBSubs, which can be done, however I also want to get their subscription billing information (credit card information) set up for the subscriptions rather than having our entire membership have to go out and enter it themselves manually once it goes live. Does that make sense?

CBSubs does not store any credit card information. This is all stored and handled by the payment gateway (authorize.net in your case). As far as I am aware there's no way to upload said data and the user would need to do this themselves on renewal or re-subscription.