open the blueprint then on the menu bar click class settings. in the details panel in the class options section you will see parent class. changing that should work to re-parent your blueprint.
just tested in 4.17 and it worked
open the blueprint then on the menu bar click class settings. in the details panel in the class options section you will see parent class. changing that should work to re-parent your blueprint.
just tested in 4.17 and it worked