Help Asset Editor: import an asset as prop

[Abj79]

While editing a new custom asset with the asset editor, with the button "Add sub building" I've added the existing asset "Park Restrooms #1" (it's a park asset from Park Life) and placed into the mine one. Once in the game, when I place the new custom asset (correctly built) the game says that the only way to use it is to include it into a park area. So I must place a Park Entrance, draw a Park Area and so I can place my new asset containing the "Park Restrooms#1" asset. Is this avoidable? Can I use an existing asset importig it defunctionalizing it like copy-and-paste it as a prop?