Thanks for the link. I've read through it, and I now have a BOM that properly reflects what I want! AR shown in the BOM's quantity column for my bulk item.
I may have overstated some details for doing this...
The way I put AR in the quantity column is to change the report symbol in the repeat region for the column from rpt.qty to rpt.rel.User Defined, then enter "quantity" (without quotation marks) in the Symbol Text window that pops up.
Then enter/create a repeat region relation in the Relations editor pop up window for the repeat region (mouse picks: Repeat Region, Relations, select/digitize BOM repeat region):
IF asm_mbr_type == "BULK ITEM"
quantity = "AR"
quantity = rpt_qty
After hitting the OK button on the Relations editor window to close it, toggle the Switch Symbols button. If all goes well, AR will now be in the quantity column for the Bulk Item(s) in your assembly.
You need to use the Bulk Item template by creating a part within the assembly and selecting the Bulk Item template.