It is possible in the program to display only selected walls on other floors. This is a great help when designing multi-storey buildings, as it allows you to display only certain walls on the lower or upper storeys, so you don't have to display the whole floor plan. This means that the design is much cleaner and simpler, as only the necessary walls are shown on the other levels, rather than the entire floor plan. You can also set the line type and color of the displayed walls. The line type is specified in the wall dialog and the color can be changed in Options > Graphics > Workspace > Inactive building or visible but inactive floor color.