Can you post a picture of your drawing? or the actual drawing.
if i am understanding your question correctly, you want to convert 2d drawing(dwg/dxf) to 3d.
if this is your question.please see the snap shot below.
just drag and drop your file on solidworks window, you will get below window.
make the selection as show below to get your non parametric 3d model.
your model should be having proper views for this to work.if the 2d drawing was created with any other cad. this procedure will help in saving lot of time.