how to change object after drop item into static one?

Hi, i am trying to spawn my objects, grab them, and then drop the object. That all works fine. But i would like to change the object type after drop into a static one, in the same location. Then its easier to build with the objects. Otherwise the building start to collapse within the minute :slight_smile: But i have no clue whats the best way. It seems not so easy as i hoped! Do you guys have a good way to do this?

best regards robert

Is this the place where i should make the adjustments?