Virtual domain forward to another postfix server

I have a postfix [server A] with dovecot, milter, sals, mysql, postfixadmin and roundcube and I need to forward the inbound mails for a specific domain to another postfix [server B], how I do this with a virtual domain or a virtual mailbox, please take note the domain I need to forward is the name space server A is running under,

Thank you in advance.

Found solution using /etc/postfix/transport.

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