Before you record a scenario or a process, usually, you first assign a procedure activity to the relevant business process.
If you want to:
Model a scenario, you assign the procedure activity to a business process of type Scenario.
Record a process, you can assign the procedure activity to any business process. Usually, this is a business process to which no flow is assigned.
You can assign procedure activities to a business process in several ways:
Assign an existing activity as procedure activity.
Create and assign a new activity as procedure activity. By default, this activity is of type Scenario.
Assign a copy of an existing activity as procedure activity.