Sculpting on multiple planes


How can I sculpt over multiple planes (or objects) without joining them together as one? I’m trying to make a low poly scene but I can’t simple sculpt all of the planes at once, and another thing, how can I turn the symmetry with the sculpting tool off? Thanks for any help!

You can only sculpt on one object at a time.
You can join, sculpt, separate

how can I turn the symmetry with the sculpting tool off?
Symmetry/Lock settings when in sculpt mode

Thanks for the reply, I found the symmetry thing, but how can I re-separate the 20x20 chunks back into their original 20x20’s after joining and sculpting them? Cheers!

One option:
Mark all edges as sharp (Ctrl+E)
Sculpt with multi resolution modifier then apply the modifier
Add Edge Split Modifier marked to use Sharp Edges and then Apply it
Reset the object origins