RB1100AH 4th WAN port

I have 3 wan connections and I need a 4th.

Port 11: 5 GHz Network linking remote stations back to the noc
Port 12: Cable ISP
Port 13: DSL ISP (PPPOE)

I want add a 4th ISP bring me internet via fiber. Can I use port 10 for that?

Do I simply remove port 6 as the master for port 10? How do I remove it from the switch group?

Dave

Sure, just remove ether10 from the switch group by setting mater-port=none.