Is it possible to Bypass [subscriptionform] w/ multiple gravity forms and dynamically assign a Subsc

Basically I have 2 Gravity forms and 1 form for 2 types of subscriptions.

Community | Premium

Both are FREE subscriptions using the free payment gateway.

The signup forms share a lot of the same information but are displayed basically 2 different page templates/designs each contain a gravity form that link to the user registration.

Are there any hooks to automatically assign a subscription to a user?

If so I can tie my my gravity forms to the user subscriptions within Membership.