Yes, you can. If you want to introduce drawings into your project, such as details of non-electrical items, these can be imported as symbols or 2D footprints using the Library function within the tool.
For DSE v1.3, AutoCAD DWG 2013 is the latest supported version.
The key point here is that existing electrical schematics imported as DWG files would not have the intelligence of the features in the tool and hence would not generate the benefits in use. Our recommendation is to create new drawings using the old drawing as a guide. Using the intelligent features in DesignSpark Electrical, this can be done quickly and easily.