Sorry, it has been a while since I tried it and forgot which one was not working.
All I want is this mangle rule:
chain=prerouting action=mark-routing new-routing-mark=giga passthrough=yes dst-address=45.60.0.0/16 log=no log-prefix=""
to use ether4 which has input IP:192.168.42.2 as the primary Distance and secondary Distance should be the LTE1.
It shows that the "/ip/route...Routing Mark" in V6 was replaced by "VRF Interface" in V7. In V6 I can just click the drop-down on "Routing Mark" and choose "giga" but I don't see this same option in V7.
It's still mostly the same. Mangle rule didn't change at all. You just need to define routing table first (that's new) and route's routing-mark is now routing-table. And currently you have to use command line for both, because WinBox interface is incomplete.