To Add Reference BOM Balloons
You can create additional reference BOM balloons for each component in different views. The REF designation appears as shown below for simple and quantity or custom balloons. Reference BOM balloons are only available for components that already show BOM balloons.
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You cannot create reference balloons for bulk items, included items, flexible components, and Family Table top generics.
To add a reference balloon,
1. Set the drawing filter to "component."
2. Click the part to which to add the balloon. (You can also select from the model tree.)
3. On the Table tab click Create Ref Balloons. Alternatively, right-click, and click Create Ref Balloons on the shortcut menu. The reference balloon is added to  the part.
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The text for the REF balloon is set by the Detail option reference_bom_balloon_text.