Pre-register/pre-pay Q

Hi Tim,

Just checking ive got this set up ok for when it goes live .. 

So i've got a gallery currently in production under pre-reg/pre-pay where the customer can decide to simply register details for free / or prepay for a pack at a discounted price.  I have set this gallery to "Customers WILL return later to select photos for ALL pre-ordered products"

So just want to check, when I go live, the customers that have pre-ordered will select their images to fulfil their package .. but those that chose to pay after viewing, they will see a normal post-pay gallery?

Just checking as ive never done a "half and half" gallery before so unsure of user experience.

Im shooting the experience next week.

I would also like to know if the pre-pay people would like to spend MORE money then they pre-booked for, is there some way to facilitate this?  Like, how to upgrade if possible?

Thanks for your help!

All customers will have all the same products available from the price list to purchase. 

Those that pre-ordered will automatically have their pre-ordered products in their cart to select photos for like they add photos to collections.