need some help with policy routing

i have some networks on vyos router 1) 192.168.0.0/14 private lan 2) xx.xx.251.0/24 real ip. All networks on bond0 in different vif, i need rules to sent private lan on 172.20.0.1 (default gw for private) and xxx.111.248.93 gw for real ip-s. Can anybody help with examples or doc’s. Sorry for my english