COMM_GEN - Can we merger multiple letters into 1 document and output directly into Report Manager?

Is there another option in COMM_GEN that will allow us to send the multiple pages of letters to Report Manager directly instead merging the letters together and putting the output into a pdf file? 

The "Preview Option" allowed the first 10 letters to be displayed in Report Manager.  However each letter was an individual document in Report Manager that would have to be opened individually in order to print the letter.  There is an option within BI Publisher Report Definition settings that allows us to merge multiple letters into 1 document and output as a .pdf file on our file share.