flatten

Occasionly we get surveyor drawings we use in developing our drawings.

 

Using ordinary AutoCAD commands:
CHANGE<enter>
All<enter><enter>
Properties<enter>
Elev<enter>
0<enter>

If that doesn't do it, there's always the Express Tool FLATTEN.
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What about flattening lines and polylines within blocksÉ Most of our
drawings have hundreds of blocks-some nested.

 

Why do you need them flattened? I'd think you'd only need to flatten those
objects you will be modifying in your shop. If you really need to flatten
blocks, you could EXPLODE them and go from there.
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We do modify blocks frequently as the project evolves. The way I see it an
autocad dwg has a database in there with data for all elements in a drawings
including block definitions. Therefore if somewhere in that db there is a
field with z position values, it should simple to edit that to zero.
Otherwise when drawings have non zero z values, using commands like fillet
becomes difficult. (ie. a line might intersect another in plan but in 3d
they dont if one line is above or below the other.) get it? Some had sent an
lisp program to solve this but it didn't work too well. Some blocks vanished
and lines were askew.

 

so explode them first