Cubecart 4 Custom Mods

I am in desperate need of a custom mod for cubecart 4. I basically need to have two sets of product options. One will be visible to users that are not logged in, and the other will be visible to users that are logged in. These all need to be editable via the admin backend. Also the prices for product options for users that are not logged in will include VAT. User that are logged in will NOT include vat but will need to be added at the checkout.