Subflow

Use a sub flow to enrich your data, for instance let a subflow look for a CRM customer-number, not found in the customer state? then ask it and get the data via a Data adapter action

Execute a sub flow

Using Sub flows you can accomplish great flows of automation. For instance, create a flow which automatically triggers and let it do the first intake. Depending on the choice made let it execute a sub flow which holds all the automation needed.