Hi There,
As per your requirements here are possible work around.
>> Is it possible to restrict users to use flows and they can select only a set for the flow set by the organization?
Yes. Use Data Loss Prevention (DLP) policies in the Power Platform admin center to limit the connectors users can employ. Additionally, you can guide users towards an organizational Power Automate Template Gallery, as suggested in the provided article. By doing so, users can only utilize pre-approved templates, ensuring governance.
>> Can the concept of Child flow be used for regional Power Automate flow distribution?
Answer: Yes. Child flows are suitable for this requirement. Centralize the core logic in the Parent flow, while Child flows can handle regional specifics, like dynamic approvers. Utilize SharePoint or Dataverse to maintain a master configuration of approvers by region. Child flows can then reference this data to determine the appropriate approvers dynamically.
Please give kudos and mark as solution if it helps.
Thanks,
Sandeep Mishra