Port Forwarding across repeater

My main home router (192.168.1.x) uses PPPoE to connect to ISP. I've a repeater (192.168.0.x) connected to my main router. Now I've computer connected to repeater, say whose IP address is 192.168.0.125, which needs few open ports.

How do I use port forwarding on main router to connect to my computer, which is on a different subnet than my main router?

Thanks for reading.

From the main router, you forward the ports to the repeater; then, on the repeater you forward the ports again to the computer.

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