So on the 4th depth down, you get to a rest stop, and can go up or down.
But right now the entire party has to go up or down. You can't have some people go to the up elevator and others to the down elevator.
Tonight, I had to use "leave party". Does doing this cost me anything? Do I have everything when this happens?
You can do this already.
All the people have to be on an elevator for it to work, though.