ASBL, NA, NL, --, KEEPA, KEEPL
Subtracts lines from areas.
NAArea (or areas, if picking is used) to be subtracted from.
 If ALL, use all selected areas.  If P, graphical picking is enabled (valid
only in the GUI) and remaining fields are ignored.  A component name may also
be substituted for NA.
NLLine (or lines, if picking is used) to subtract.  If ALL,
use all selected lines.    A component name may also be substituted for NL.
--Unused field.
KEEPASpecifies whether NA areas are
to be deleted:        
KEEPLSpecifies whether NL lines are
to be deleted:        
Generates new areas by subtracting the regions common to both the areas
and lines (the intersection) from the NA areas.
 The intersection will be a line(s).  See Solid
Modeling in the Modeling and Meshing Guide for an illustration.  See the BOPTN command
for an explanation of the options available to Boolean operations.  Element
attributes and solid model boundary conditions assigned to the original entities
will not be transferred to the new entities generated.