How can I model the sub-system in the use case diagram?

General Questions/Discussions
1

Good evening
I am using visual paradigm version 10.0
Please help me how can I model the sub-system in the use case diagram?
What is the notation that models the sub-system?
Best wishes

2

[quote=RippleMan]I am using visual paradigm version 10.0
Please help me how can I model the sub-system in the use case diagram?[/quote]
Officially there’s no such thing in a Use case, though you do have the System boundaries which you can use to identify a specific aspect of your case.

However, if you’re really looking for a whole new diagram then I’d suggest using VP’s “Sub diagrams” system; hover the mouse over your use case until the icons show up, then check the lower right corner of the use case (or actor and even the system uses this). This allows you to create a new diagram which will be referenced by the original which allows you to set up sub systems.