Got it now, need to do from the Quote side but a huge thanks to @timshuwy for the assist to set me on the correct path! Solution is like this:
based on: Help debugging BPM Code
First Query setter adds to the dataset for the comments desired.
Second and Third fill the UpdExtSalesOrderTableset appropriate lines/header fields respectively.
Last use the BO to update the recordset in the DB. Hurray!