How to purchase Add-ons separately from base offers?

Add-ons sold separately from base offers. In new commerce, partners purchase the add-ons from the catalog itself, no longer having a bifurcated purchase experience for base offers and add-ons; both base offers and add-ons are displayed in the catalog in new commerce.

The major difference in the purchasing of add-ons between existing license-based and new commerce is in “how” they’re purchased. In existing license-based, the partner applies the add-on to a base offer subscription after that base subscription has been purchased. In new commerce, partners purchase the add-ons from the catalog itself, no longer having a bifurcated purchase experience for base offers and add-ons; both base offers and add-ons are displayed in the catalog in new commerce.