Guides:
https://www.youtube.com/watch?v=kYFNa_zpeII
https://homenetworkguy.com/how-to/configure-opnsense-firewall-rules/
https://homenetworkguy.com/how-to/firewall-rules-cheat-sheet/
https://docs.netgate.com/pfsense/en/latest/firewall/configure.html#Source
Just make a rule on the LAN interface in the IN direction that allows everything from source 10.0.0.10 to destination 10.0.50.11. When OPNsense has interfaces in both networks with appropriate IP addresses set, it should just work.
Thanks <3
it seems at some time i had it working but the problem actually is my managed netgear switch.
somehow it screws with the vlan tag from my access points (AP sets them according to ssid)