How to forward Public IP address to local router

RouterOS Beginner Basics
1

I have the main Mikrotik router RB2011 and sub-Mikrotik router RB951, the ISP provides two Public IP addresses to the main Mikrotik router:

IP address: X.X.120.2/30
Gateway: X.X.120.1
IP address: X.X.130.2/30
Gateway: X.X.130.1

The Main Router ether1 connected to the WAN cable (Internet) The Sub Router ether1 connected to the Main Router ether2

I need to make one Public IP address for main router and one for sub-router

2

Could you add a bridge interface on Main Router with ether1 and ether2 as member ports? Give the bridge interface on Main Router the x.x.120.2 address. Give the ether1 interface on Sub Router the x.x.130.2 address.