Yes, you can do this by having your free plus shipping offer as the primary offer. Then set up a secondary offer with the recurring charges. Make sure it is a free trial. Make sure both are memberships. And it must use credit card for checkout. Then go into the primary offer and choose the option for "combined memberships".
![](http://media.nanacast.com/images/Combined Memberships.png)
You can then checkmark to allow or not allow the option of checking/unchecking the continuity.
Keywords: continuity membership