Call workflowCall another workflow
This must always be used in conjunction with a callable trigger. It can be used to send to data from your current workflow to aonther workflow for processing.
It is a very powerful tool for simplifying your workflows and allowing you to work with a 'modular' approach - i.e. multiple workflows can call one workflow which can carry out repetitive processing tasks.
Please see the Callable Trigger documentation page for a guide on how a Call Workflow / Callable Trigger setup is made.