When importing a CAD drawing into a drafting view, how do you remove layers that you do not need?
Select the imported CAD drawing, click the Query tool, and then in the dialog that appears, click Delete.
Select the imported CAD drawing and, on the Properties palette, click Edit Type > Delete Layers.
Select the imported CAD drawing, right-click, and select Delete Layers.
Select the improted CAD drawing, tab to select elements you don't want, and then press Delete.