Posted by newbee1 on Mar 26, 2012; 7:21am
URL: https://forum.librecad.org/DXF-compatibility-was-Unit-Conversion-DXF-compatibility-tp5587846p5594450.html

Hy John(tux-lab),

after you imported the drawing into Freecad, you will have to start at one point of
convinience, click one line element, and follow the sequence around as if you follow
a circle. Clockwise or the other way around, does not matter. ONLY important is, that u
click the single line elements,; even the smallest ones; in the sequence as if it is one
non-interupted line. After that u need to click once on the ARROW for upgrade, so will
be assembled as one line entity inside Freecad. Is it done, u will se the appearance of an new Element
in the left side Entity-tree-view. NOW u NEED to click exactly on that entity,
IN THE TREE-View,    
and then on the EXTRUDE-Icon next to the upgrade ARROW in the TOOL-Bar.
Another way could be to do the selection and operation via Python,  but i am far from
knowing how to do that.

If you are interested, i may give it a try, if u have a chnace to upload your dxf
somewhere, and post the LINK. So then i can give you more feedback.

Hope i could help in som way, best wishes,
regards
newbee1

P.S. Almost forgot, u shell select PART- or PART-Design Workbench to get needed
      Icons for upgrade and extrude in the toolbar.