Questions for Dunning letters

Hi,

We are using R12.2.7. Recently our users would like to use the Dunning letters from the AR module (we didn't install the Oracle Advanced Collections IEX module). There are two requirements which we are not sure it can be achieved:

1. Send the dunning letters at different stages -> we have 3 stages for the dunning (61-90 days, 91-120 days and 120 days) and user would like to generate the dunning letter at a batch for 1st stage first for example.
2. Once the draft dunning letters are generated and reviewed, able to exclude some customers from receiving the dunning letter even they have.