QTY column is hard coded and we cannot enter text info. You may create custom BOM properties as per below steps:
1. command AMBOM>>Settings>>Create 2 custom properties as shown in image-1 and re arrange the properties as required on the BOM tab
2. Click on Balloon Tab>>Settings>>Choose "Circular to Text" option>>OK
3. In the expression, select first expression as =<Item> and second expression as =<REF> click Apply>>OK>>OK
4. command AMBOM>>Settings>>Balloon tab>>Settings>>Choose "Circular" option >>OK>>OK
5.Create Balloons on the views
6. For the balloon (split) to show REF (reference) in the bottom part of the balloon>>Double click that balloon and choose "Circular to Text" from "Balloon Type" Drop down.
7. For adding AR in the Qty (This is the custom prop created in step-1 ) column>>Add AR on the required parts. (Image-2)
Let me know if this helps or can you attach a image file with expected behavior.
Thanks,
Sridhar