These instructions can be viewed in more detail at TC Electronic's support page by clicking hear.

By interconnecting multiple Konnekt devices directly to eachother, you are able to add more inputs and outputs.

For each Konnekt device, you can select 2 channels (either analog, S/PDIF or ADAT/TOS), which will appear as 2 channels in the Konnekt mixer of the other Konnekt devices in your TC NEAR network.

For Example:
Let's say you have 3 Konnekts, 2 Konnekt 24Ds (A + B) and 1 Konnekt 8s ( C).
On device B, you select S/PDIF and on device C you select ADAT.
In the Konnekt mixer of device A, you will now see 2 channels of S/PDIF from device B and 2 channels of ADAT from device C.