How to remove entry from BGP advertisment

Hello,

We have BGP VPN to teo remote systems with IPs 172.188.32.45 and 172.188.33.45 . We are using same VR for both VPNs. How we could stop local network 192.168.6.0/24 to be advirtised via BGP to 172.188.32.45 and to be advirtised only to 172.188.33.45. We want to do it with route-map.

firewall device is SSG 520

Thank you!