The "list price" in WholeCell is used in two ways:
As an advertised price (shown to your customers) in public inventory reports
As the default sold price when inventory is added to a Sales Order without a price
You can set the list price across various groupings of your available inventory using the Pricing page:
On this page you can add the list price for each product variation in the Price field:
WholeCell will automatically save the price that you put in on that field. No need to look for a Save button below.