I need help to configure routes for 3 wan connection & 3 networks

Hello,

I am new to RouterOS, having a little bit of a hard time getting my head around this.

I have 3 wan connection in bridge mode and 3 networks. Its networks has its own wan connection

How do I setup the Routes (NAT,MANGLE & RULES) for its network to use it’s on wan connection! Not a Load Balancing!

And last when the modems restart, wan 1 & 3 get new local & remote address and i have to configure manually
every time. WAN 2 is static ip so no problem.

Can anyone help me setup up and configure it correctly!!!

rb1100ahx2

WAN 1 Guest (dynamic IP - 50 Mbps)
WAN 2 Corporate (static IP - 5 Mbps)
WAN 3 BAR (dynamic IP10 Mbps)

ether13 WAN 3
ether12 WAN 2
ether11 WAN 1

ether10 Corporate
ether9 Guest
ether8 BAR

10.0.20.0/24 Corporate WAN 1
10.0.30.0/24 Guest WAN 2
10.0.50.0/24 BAR WAN 3