I think you meant C76.
Yes, the C76 is a breakout board, that the UC300ETH plugs into. You connect the drives to it with adapter boards like this.
https://www.cnc4pc.com/c34g203-drive...v-drivers.html
The website also has a lot of sample wiring diagrams.
My preference is the CNC Room UB1 breakout board. https://www.cncroom.com/interface-cards/ub1