With Spaces v2.2 we have improved our sketching engine and introduced interactive sketch editing where your building updates while you continue sketching.
You can edit your Building (or Planning Zone) by drawing additions and subtractions, you can slice off edges or corners.
The item doesn't need to be selected but in order to update the perimeter of a building you need to have the Building tool active.
Its best explained with the following video.
Space creation and editing
Spaces and the Space tool are part of our paid subscription plans.
If you select the Space tool the interactive sketch editor will create and remove spaces.
Draw new divisions to divide up your floor plate, or squiggle to remove a division.
Check out the following video to see interactive space editing in action.
If you have divided your floor into a series of Spaces, while on the Building tool you can remove Spaces and have the building perimeter updated.
This is best seen in the video above.