Calling a Process in an Operation
You can create an operation that calls a process. This functionality enables, for example, replacement of the process called by another process without disturbing description of the main process.
To create an operation that calls a process:
1. In the object inserting bar, click the drop down menu of Operation 
.
.2. Select Called Process.
3. Move the object to the appropriate area within the diagram.
The properties dialog box appears.
4. In the Called Process field (Identification section), select the name of the called process.
In our example, "Process Purchase Request" could be replaced by "Process Urgent Purchase Request".
By default, the operation carries the same name as the called Process.5. Click OK.
The operation appears in the diagram with the name of the process.