Alright, I must have been blind or learned how to do it the wrong way initially.

Thank you for your help.

In previous versions, I used the "my blueprints" side of the blueprints page to create a master list of blueprints that I can use across any number of maps. In order to add blueprints made locally into it, the previous inventory page had a "add to blueprints" button at the bottom where you could ...