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Build a reusable subflow

In this tutorial, you will move a repeated transformation into a subflow, define its interface, and use it from a parent flow.

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Before you begin

Create or choose a workflow with a small sequence you expect to reuse. A good example is normalizing a text value before other steps process it.

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1. Create the subflow

1

Add a subflow

Create a new subflow and give it a name that describes its outcome, such as Normalize request text.
2

Define the input

Add a Flow Input block and configure a text input named request.
3

Add the reusable logic

Add the blocks that transform or validate the input. Keep the subflow focused on one responsibility.
4

Define the output

Add a Flow Output block named normalizedRequest and connect the final value.

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2. Call it from the parent flow

  1. Return to the parent flow.
  2. Add a Subflow block.
  3. Select Normalize request text.
  4. Connect the parent value to request.
  5. Connect normalizedRequest to the next parent block.

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3. Test the interface

Run the parent flow with:
  • A normal value
  • Empty or missing text
  • Unexpected whitespace or formatting
  • A value at the expected maximum size
Open the subflow’s run details to confirm that the input, internal steps, and output behave as expected.

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Design guidance

  • Give inputs and outputs business-meaningful names.
  • Keep one clear responsibility per subflow.
  • Avoid hidden dependencies on parent-flow state.
  • Document expected input types and failure behavior.
  • Retest parent workflows after changing a shared subflow.
See Subflows for the complete concept reference.