Creating the Rental Auto-Sold Modifier items
1. Create a full set of Basic Skis Only, Basic Boots Only, Basic Ski Package, Demo Skis Only, Demo Boots Only, Demo Package Only, etc.
2. These items are regular item types (not begin rental item types). These items do not need to specify the number of rental days. That is accomplished by the rental Auto-Sale Rules.
3. These items are used to generate the charges based on the checked out equipment. So, they must have the Profit Center and appropriate Dynamic Pricing Rules assigned.