If you run out of a particular product option, you can simply make it unavailable for some time in your app.
To make a product option unavailable, do the following:
Go to Locations > Shop > select your product.
Tap on
(...)
top right > pressEdit
.Select the product option under the "Options" section.
Manage the "Available for Order" switch and hit
Done
.Click
Save
to confirm your changes.
After making a product option unavailable, it becomes greyed out, and it's not possible for users to get it.
You can make the product option available for order again at any time.