Originally Posted by pshuang
Sadly, I haven't gotten a DBC dollar-denominated voucher in a long time; the terms & conditions used to make clear that you could freely combine vouchers from the same booklet, but could not combine vouchers from different DBC booklets.
This is still the case (as of my March-issued VBD TCs).
Originally Posted by pshuang
The fundamental differentiation is that some vouchers are considered "Type A", or discounts; others are considered "Type B", or a form of payment...
../knowledgeable agents usually will allow you to combine a "Type A" discount voucher with a "Type B" payment voucher.
This has been my experience.