Yes. The material on print page iii (The Units list) is a contents in brief. That should be in volume 1 in its entirety. Then you also would include the part of the full contents that actually occurs in volume ... likely not the whole first unit 🙂
The repeated contents should just occur in braille where they occur in print (BF 2.10.14). So say that Unit 1 ends on braille page 45 of braille volume 4. Start Unit 2 on a new braille page and begin with the contents as shown in print. I would say that you should then start the actual text of Unit 2 on a new braille page as well just to separate the different types of formatting as the contents entries will have line numbers and the text will not...but there isn't a rule about that 🙂
Cindi