Information has been added about sub-workflow activity under the Flow Control Activities section. The sub-workflow activity lets you trigger the execution of another workflow and recover the results and lets you use complex workflows while using a simplified interface.You can call multiple sub-workflows in a single workflow. Sub-workflows are executed synchronously.
To read more about
sub-workflows logs and behaviour in case of error, check out this detailed documentation: Sub-workflow
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Sukrity Wadhwa