@AmolJ 

In you Subflow, add 'Assign Subflow Outputs' and capture the created record details. This can be used in main flow for subsequent Subflows or actions. This will not have any impact to existing flows since you are not introducing additional actions

Below is sample for reference

Refer below documentation for more details

https://developer.servicenow.com/dev.do#!/learn/learning-plans/zurich/servicenow_application_develop...

I hope you appreciate the efforts to provide you with detailed information. If my response helped to guide you or answer your query, please mark it helpful & accept the solution.

Thanks,

Bhuvan