DWG Face recognition, Issue

Good, Afternoon. I have an issue. Importing DWG file, try to generate the faces, but generate a unique face, without the recognition of drawed lines.
Can someone help me?

Check out our new course on working with CAD files:

…specifically this lesson:

Method 1: In Using CAD in SketchUp Without Cleanup " Identifying and separating out anything that was a block in CAD but is now a component in Sketchup"
Is there more information about how to identify these components ? If multi layers are grouped together then by turning off any of the layers in the group does that turn off all layer in the group ?