34925A single bank operation

34925A module consists of two individual banks of 40 channels (one wire mode) each. I intend to use the module as a single bank of 80 channels (one wire mode). The module's user manual provides these directions:

1. Connect through analog bus relays.

OR

2. Use external wiring.

I wish to know if someone has knowledge regarding how to achieve any of the above mentioned techniques so as to use module as single bank of 80 channels (one wire mode).

Thanks