LoopfourSub-workflow Block
Call another workflow as a step for composable automation
The Sub-workflow block calls another workflow as a step within the current workflow. Use it to build reusable workflow components -- for example, a standard invoice creation workflow that can be called from multiple trigger workflows.
Configuration
| Option | Type | Description |
|---|---|---|
workflowId | string | The ID of the workflow to call |
input | JSON object | Passed to the sub-workflow as its input, so the child reads it as {{input.<field>}} |
waitForCompletion | boolean | Wait for the sub-workflow to finish (default: true) |
timeoutMinutes | number | How long to wait for the sub-workflow when waitForCompletion is on (default: 5, maximum: 1440) |
input must be a JSON object. The step fails before starting the sub-workflow if input is text, an array, or a single value, or if it leaves out (or leaves empty) a field the sub-workflow's input schema marks as required. Without that check, every {{input.<field>}} in the sub-workflow would resolve to an empty value and the run would fail later, at a step far from the cause.
Workflows saved before this field was renamed may still use inputMapping (for input) or timeout in milliseconds (for timeoutMinutes). Both are still read, and the next save in the editor moves them to the current names. A value that cannot be moved (it differs from the current field, or it is a templated timeout) appears in the editor as a Legacy field until you clear it.
Outputs
| Output | Type | Description |
|---|---|---|
result | JSON | The sub-workflow's final output |
runId | string | The run ID of the sub-workflow execution |
status | string | Final status: completed or failed |
Example Pattern
Reusable Invoice Creator
Main workflow:
Salesforce (deal won) -> Transform (extract deal data)
-> Sub-workflow (Standard Invoice Creator)
-> Slack (notify finance)Sub-workflow ("Standard Invoice Creator"):
Start -> Stripe (create customer) -> Stripe (create invoice)
-> Loop (add line items) -> Stripe (finalize) -> Stripe (send)