Distinguish existing structure in remodel

[Rich Winsor]

Something like this came up a little while ago. You can get the
results you want using Build / Wall / Hatch Wall. You can break
the walls where ever you want the hatch to change and the hatch
tool will let you select the broken sections. To achieve solid colors
set the "Fill Pattern" to "Solid" and choose your color in the "Wall
Hatch Specification" dbx. In the example I set the default exterior
and interior wall colors to blue and light blue respectively using the
"Wall Specification" dbx. Then I used the Hatch Wall tool to change
the portions of the plan that were proposed to red and light red.