Joining walls in the middle

[michaelbr]

If I have a basic floor plan already made and decided to add one wall in the middle of existing wall, is it possible to join them? I've searched the net, but all the solutions I found is join the beginning of wall to the end, and not in the middle, and I've tried to use the Advanced plugin, but couldn't make it work.

[Puybaret]

Walls can be joined only at their ends.