Hello! I'm new to houdini and i'm looking for some advices. I'm creating a building and I generated a wall with different panel BUT I also combine them at the end.

At the first image this is the result I want to reach but it's only with a switch/merge(cf second screen)
The question is : How can I ask the switch to delete the other panel and get a randomize panel with different wall at the end ?

currently I'm at the state of image 3, advices appreciated

cheers