Replication with more than 2 sites

We currently replicate VMs from site A to site B, between non-linked mode VCenter 6.0 environmeets.

Having a hard time wrapping my head around how to replicate VMs from site C to site B.

If I bring up another replication appliance in site B to receive from site C, it conflicts with the existing appliance.

Is this a supported model or am I just going about it the wrong way.

Thanks for any guidance