The product page could have a "upgrade price" field that you can enter the cost to upgrade. Maybe have a "product version" field as well to compare against.

Comments

gordon’s picture

gordon commented

This can be done with a new module which implements the hook_product_specials() and some code which changes the product form.

This is not a big development.

sime’s picture

sime
any/any
Location Melbourne
commented
Component: product.module » product
Status: Active » Closed (won't fix)

Looks like a general site development issue.

Please re-open if you feel this is in error.