Forwarding between 2 mikrotiks

Hello guys.
I need some help.
I have an RB1100AHx4 Dude from one side and hexS from another, connected via pptp.
So, main network routing at 192.168.1.0/24, at hexS - 192.168.88.0/24.
I need to solve, how ppl at main network when they`re trying to connect via rdp to 192.168.1.10 avtomatically connect to 192.168.88.200?
Latest version of routerOS on both side.
Plz help to me!