Membership Pro with OS Property Upsell

Not sure what category to add this too. I have OS Property with Membership Pro setup. I have 3 plans setup in Membership Pro to let user sign up for base accounts (Free, paid) of different length. These base accounts allow users to add non-featured properties.

I have then setup an up-sell plan in Membership Pro to allow users to upgrade their properties to featured for X more dollars.

My question is what are the options around up-selling the user during checkout? Can add a custom field to the sign up form to up-sell the plan or is the only option to update the email sent out with information around up-selling to featured properties?

Thanks for your help. Mark

Hi Mark,
In fact, there aren't any difference between normal subscription plan and up-sell plan here. User can use their "Featured" subscription plan to upgrade their properties from Standard to Featured. Whenever they "upgrade" one property, their "Featured" account will be reduced one.
Thanks
Dam