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« on: September 14, 2010, 03:22:18 pm »
You have to build something like this:
5 ___>___ <-- This is the room you want to build
4 ###X###
3 ###X### <-- These are the rock layers below
2 ###X###
1 ___<___ <-- this is the floor you are in
# - wall
_ - floor
> - down stair
< - up stair
X - up/down stair
Suppose you are on floor 1. Chose a point where you want to dig up. If there is a natural wall at this point, designate carving an up stair (d-u). If there is a floor, construct one (b-C-u). On floor 2, just above the up stair (there is probably a natural wall there), designate carving an up/down stair (d-i), and repeat this until you reach the top. On the floor where you want to build your room (floor 5 here), designate your room area for digging (d-d), and a down stair (d-j) on the tile above your up/down stairs.
You can designate everything in one step, you don't have to wait to finish one step to be completed.