Let's say you have a key database file named keys.kdb.

ls -l /shared/qmgrs/MANAGER01/ssl/

-rw------- 1 root root 1415 Jun  4  2020 keys.kdb

Let's say keys.kdb contains a certificate named "example.com".

Certificates found
* default, - personal, ! trusted, # secret key
*- example.com

The -rename option can be used to rename a certificate. Here is how to rename the certificate from example.com to sample.com.

${install_root}/gsk8/bin/gsk8capicmd_64
-cert
-rename
-db /path/to/keys.kdb
-stashed or -pw your_password
-label "example.com"
-new_label "sample.com"