I have dxf files of the floor plans of a 6-story building. I’ve imported them to SU, making each a locked group and assigning it to a layer of its own. Next I’d like to build a SU model based on these plans. I’ve drawn a floor plane on top of the first floor dxf, then made that plane a group. I assumed that when I opened that group, any modeling I do there will be separate from the dxf. But not so. Sometimes lines I attempt to draw within the group respond to the locked dxf instead of the geometry in the open group. For example, if I attempt to draw a line from one side of a rectangle to the other, sometimes the line registers in the open group as a thin line. Other times it registers as a thick black line, not integral with the geometry in that group.
How can I isolate the dxf and prevent geometry in my new group from connecting to the dxf? Help will be greatly appreciated.