You can use AutoCAD (DXF or DWG) files and MicroStation (DGN) files in graphical templates. Template Editor imports the files and converts their contents to a group of shapes, so you can modify the imported data in Template Editor.
Find out more:
Importing AutoCAD and MicroStation files with import method defined in Template Editor
Importing AutoCAD and MicroStation files with no import method defined in Template Editor
Setting fill type and font import settings in Template Editor
Limitations in AutoCAD and MicroStation file imports in Template Editor
AutoCAD and Microstation import errors in Template Editor
Modifying imported AutoCAD and MicroStation files in Template Editor