Availability
A product's availability always depends on the order period, meaning you can't see availability details until an order period is specified.
As soon as you selected a rental period, Booqable will show you how many items you can add to the order:
Quantity
If you added a bulk product or didn't specify stock items for a trackable product, you can simply adjust the quantity using the input field.
If you added specific stock items however, the only way to lower the quantity is by removing those stock items from the order:
