Reply To: TOC in two related volumes
The additional information provided in your response that was not given in the first message turned out to be significant enough to change my answer.
It appears that this book will be brailled as two separate books to accommodate separate usage, if a client orders it. I think it is very important to clearly differentiate the PRINT volumes from what will be the BRAILLE volumes. Referring to them both as "volumes" doesn't work. Basically, follow print. The contents refers to print volumes and will be divided into braille volumes in volume 1 of each book.
I suggest referring to the PRINT volume 1 as Book 1. Follow print for the contents listing in each book. Consider a general TN on the TN page of the first braille volume of each of these that explains the book is divided into 2 print books. Consider an embedded TN identifier in each instance of {print}[simbraille] ,volume #a ,',book #a,'[/simbraille] Do the same for [Volme] Book 2
List contents as in print. For Volume 1 of Book 1, show the braille volume divisions as usual. In subsequent braille volumes, show only the contents in that volume, as usual. Do not repeat the contents listing of Book 2. You may consider inserting a TN preceding the listing of the Book 2 contents to say that the following page numbers and contents items are printed only in Book 2.
Apply the same process to Book 2, explaining the same things in case Book 2 is used separately in the absence of Book 1. And vice versa!
I have addressed only the contents since that is what you asked about. I hope this is helpful.
--Joanna