To make your products bookable, check the “Bookable” option next to the product type dropdown. It is available on simple, variable, grouped and bundle products.
Variable, grouped and bundle products
For these product types, you can mix bookable and non-bookable variations/children. If you have at least one bookable child, the parent product must always be bookable.
You can set a variation as bookable or not in its own panel.
Simple products and variations
You must set a regular price for simple products and variations.
Grouped products don’t have a price field. But you must set a regular price on all children (simple products or variations).
Parent product price is optional but you must set a regular price on all children (simple products or variations).