Schematics has two meanings. You have schematics in your datapad that represent the things you can make with your current skills. If you drop those skills, those will drop off your datapad and you will not be able to craft those items once you surrender those skills.
Factory schematics are things you make and they are resource specific. Those you could keep after you surrender the skills but they can only be used to make up to the number of items the schematic was designed for when you created it, and you need EXACTLY the same resources in order to use the schematic to make things. When I say exactly the same resources, what I mean is if you used the Copper called Asau (for instance) in the schematic, you would not be able to make items using any other copper, you would HAVE to have Asau in sufficient quantities to complete the run. Once used, these schematics disappear.
So in summary, if you learn crafting skills and then surrender the skills, you will no longer be able to craft those items.
Master Artisan/Master Architect/Master Merchant