3Com 3CRWX120695A Reference Manual page 113

File > Drawing Utilities > Purge. Make sure purge nested items
is selected. Click Purge until the option is greyed out.
CAUTION: In AutoCAD, you cannot delete a layer if the layer is not
empty. However, in TurboCAD, Options > Layers allows you to delete a
layer even if there are objects in it.
Create RF-specific layers and move walls, windows, doors, and other
objects that affect RF propagation from other layers into the new
layers. For example, create a new layer called RF-ExtWalls for external
walls, and move all external wall objects into that layer. In 3WXM, you
can easily select all objects in the layer and assign the same RF
attenuation value to them. Create RF-IntWalls for interior walls and
RF-Windows for windows.
If walls or windows are shown with multiple parallel lines, delete all
but one of the lines. (3WXM can remove unneeded parallel lines
during cleanup too, depending on how close together the lines are.)
To create a new layer in TurboCAD 9, select Options > Layers. In
AutoCAD, select Format > Layer.
To move objects to the new RF layers, click-drag to select objects,
select Modify >Properties, and change the objects' layer.
Save the drawing on DWG and DXF formats, in case one format does
not import well. To save the file into a specific format, select
File >Save As and select the format. Use version R2000 of the format
you save as, if available.
Importing or Drawing Floor Details 113