1. Click on Link Existing Model for the selected symbol and link
Or
Click on the Down Arrow 
and Select the Link Existing Model
The Link Model to Symbol dialog box displays.
2. Select Manufacturers
3. Enter Model Code
4. Select Available Model
5. Click on OK
6. Click on Add New to add new Model and link it with the selected symbol, then save it in the library.
The Add new model dialog box displays.
7. Add a new model for the selected symbol and link.
8. Enter model data, link accessories, documents and CAD files.
9. Click OK to link the selected symbol.