Calling the Subprocess Call step with the selected Group Call parameter supposes that on executing the subprocess, several subprocess instances will be started according to the specified splitting parameters. Subprocesses can be started manually or automatically depending on step settings.
As an example, consider the case of the process with two nested subprocesses in manual mode:
The Insurance Expense Budget - Collecting legal Entities Data, Aggregation, and Approval at Holding Level subprocess with manual startup.
and the subprocess for legal entities Insurance Expense Budget - Creation, Approval at Legal Entity Level with automatic startup.
To execute the Subprocess Call step, execute the following steps:
Start the process for execution.
Select the subprocess Insurance Expense Budget - Collecting Legal Entities Data, Aggregation, and Approval at Holding Level with manual execution in the process tree or working area, and click the 
Finish button. To set group call parameters, open the Subprocess Call dialog box.
In the Subprocess Call dialog box in the Start Parameters area, the values, for which subprocesses are started, are automatically specified:
Click the Run button.
For each parameter Organization Structure (CFO), a single subprocess instance is started:
For the subprocess Insurance Expense Budget - Creation, Approval at Legal Entity Level with automatic execution, nested subprocess instances are started automatically:
Execute all steps of a single subprocess instance. After all the steps are executed, the executed subprocess instance is displayed in the monitoring window.
Thus, the monitoring window contains only the process and subprocess instances with execution steps.
NOTE. Executed subprocess can be displayed in process tree with all steps after execution, if the Show Finished Instances of Processes that are Subprocesses checkbox is selected on the Parameters page of the Setting Up Parameters and Administrating Business Processes dialog box.
After executing subprocess steps it is available to view the execution log.
See also:
Process Execution Monitoring | Executing Process Steps in Manual Mode | Rejecting Process Step | Process Stages/Steps Execution Log