Hi Bhaski,
There’s something called “Linked workflows” that would enable this behaviour. This subject has been discussed in the forum previously:
Calling another flow inside a flow without using fragments - Flow Classic - Novacura Forum
Linked Workflow not running at end of execution - Flow Classic - Novacura Forum
Flow help on linked workflow: End step | Flow Help
As an option you can trigger Machine Workflows using the REST connector. Generate link | Flow Help