You can use a symbol in assembly drawings to indicate the side of a part to which a connecting part is attached.

1. Select Drawings & reports > Drawings properties > Assembly drawing .
2. Load drawing properties that are as close to the ones you need as possible.
   
3. Click View creation , select the view and the properties that you want to change, and click View properties.
   
4. Click Part.
5. On the Content tab, select the Connecting side marks check box.
6. Click Save to save the view properties.
   
7. Click Close.
8. Click Save to save the drawing properties, then click OK and create the drawing.