As Feyh said, it’s currently not supported in v184, BUT however you can still make them ahead of time and kind of test them (if its a consumable it won’t be able to be consumed till next patch if its custom). As for the actual adding the item in process, it’s quite simple if you know where to look, which would be PrimalGameData_BP. If you open that up and edit it there is a master item list to which you can just simply add in new blueprints or choose from a list of currently existing ones. Hope this helps 