Hi, 

For all the production deployments there are several levels of the application testing. Once everything is done, then It will be moved to production environment.

Initially for every changes we need to create Product rule which is belong any of your RuleSets.

Inside this production rules set you need to configure all your changed rulesets with newly created versions

For more info: https://pdn.pega.com/deployment 

Regards,

Bala Gangadhar P