How to use Workflow extension Model or MicroFlow to generate multiple parallel sub-Workflow?

How to generate multiple parallel sub-Workflow from the main-Workflow, and wait for the completion of  the sub-Workflow before executing the next step of the main-Workflow? The count of sub-Workflow is based on the count of details,   For example, I created a "Payment Request Form" that contains main and detailed information. The count of details may be 1 to more than 10. My temporary solution: Define the sub-Workflow steps in the main process. But this solution is not smart……...    
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