Chapter 5 — BlockFlow · Node Reference
5.2.9 Flow node

Links to another flow, breaking complex scenarios into smaller sub-flows.
The Flow node in the BlockFlow designer.
It supports modular design, reusable sub-flows called from several places, more maintainable logic — a fix applied once — and clearer navigation between conversational stages. Typical uses: a dedicated registration or verification flow, a payment flow combining processing and API calls, or a shared data-collection flow.