Hello,
This requires using a NAT pool and a properly formatted ACL. Assume that you have a host 10.0.0.1 and you want it to be translated to 192.0.2.10 when it talks to, say, 158.193.138.40. All other flows from that or any other hosts shall be left untranslated.
The configuration would be as follows:
ip nat pool MyPool 192.0.2.10 192.0.2.10 netmask 255.255.255.0
access-list 100 permit ip host 10.0.0.1 host 158.193.138.40
ip nat inside source list 100 pool MyPool
As a terminology note, what you have configured now is not strictly a port redirection - it is only a simple 1:1 static NAT between two addresses. It would be a port redirection (or better - a port forwarding) if you had defined a particular port and transport protocol that should be NATted.
Best regards,
Peter