Subtract - Autodesk AUTOCAD 2006 Command Reference Manual

Edit Lineweight
Makes the selected lineweight available for editing.
Lineweights
Lists the lineweights in the plot style table. There are a total of 28 lineweights
including Use Object Lineweight. You can modify existing lineweights, but
you can't add or delete them. If you change a lineweight value, other plot
styles that use the lineweight also change.
When you edit a lineweight value, it is rounded and displayed with a
precision of four places past the decimal point. Lineweight values must be
zero or a positive number. If you create a lineweight with a zero width, the
line is plotted as thin as the plotter can create it. The maximum possible
lineweight value is 100 millimeters (approximately four inches).
Sort Lineweights
Sorts the list of lineweights by value. If you change lineweight values, choose
Sort Lineweights to resort the list.
Units for Listing
Specifies the units in which to display the list of lineweights. You can display
the list of lineweights in inches or millimeters.

SUBTRACT

Combines selected regions or solids by subtraction
Solids Editing toolbar:
Edit Lineweights Dialog Box | 1167