Is there a plugin or a setting to use for Upgrading program levels: Example: We have 1000 people who are registered at Tier 1 for $77 We currently only offer Tier 1. We are adding a Tier 2 for $127 with more features. We anticipate about 20-30% of these people will want the higher level. How do we manage the "upgrade" process" so we don't have hundreds of email asking (for the sake of example only) "Hey can you apply 3 days of my old membership to the new upgraded membership" or "hey i just registered and want to upgrade, can you refund me and reactivate, or apply my whole payment to a portion of the new membership" and have to manually manage all of this from a customer service standpoint. Should I make a special "Upgrade" product and they have to pay for 2 products and two different renewal dates instead of one separate one? Seems kind of unprofessional to me - especially if people are budgeting in the cost of membership and have to manage an initial fee + an upgrade fee at a different date.