For any artwork that you will only be offering as a Print on Demand option, you can set the Availability as Prints Only.

• from FASO control panel
• click on Artwork Portfolio icon (upper row)
• click on thumbnail (left column) to edit image (or click on Edit, right column)

• scroll down to Availability, click down arrow
• select Prints Only

• Save Changes

You can then set up a Collection for your Prints Only items so that they are well organized.

See this FAQ:
How to Group your Artwork into Collections

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