1, open their own CAD drawings, and save.

2, open visio interface, click "Insert", under the pop-up drop-down box, select "Insert AutoCAD", find the saved cad file, hit "open".

3, CAD files imported into visio after the effect is shown in the following chart:

4, click "Insert", in the drop-down box, select "Insert Object", "Microsoft 3.0", "Insert Object", "Insert Object", "Insert Object", "Insert Object", "Insert Object", "Insert Object", "Insert Object", "Insert Object" and "Insert Object". Microsoft 3.0", click: OK".

5, and then opened the formula editing interface, edit the formula they want to insert, complete.