This video explains how to loop Subprocess using Iteration Rule in Cloud Application Integration (CAI).

For further information, refer the following documents:
You can also loop through lists in the process.

https://knowledge.informatica.com/s/article/577264

https://www.youtube.com/watch?v=WsAfiudZ7pg&t=1s

https://knowledge.informatica.com/s/article/Set-Iteration-rule-in-Sub-process-step?language=en_US

https://knowledge.informatica.com/s/article/ERROR-Subprocess-Iteration-using-1st-element-always-in-Cloud-Application-Integration?language=en_US

https://docs.informatica.com/integration-cloud/application-integration/current-version/design/designing-processes/adding-process-steps/subprocess-step.html