I'm relatively new to solidworks and am having toublefiguring out how to edit the visibility of some imported curves

Basically I've cut and pasted an AutoCAD solid electrical panelinto a solidworks part. Its just a box with some line drawings onthe front and back (lights, vents, switchts). the issue is that youcan see the imported curves on the back right through the solidbox. Is there a simple way to change this.

Thanks

Darryl
SolidworksGeneral