Hi Liem,
in local mode you can have access to either a BW or a HANA system. If you already have the SAP logon gui installed, you should see those systems available in your design tool.
The system will look at your saplogon.ini file to check which systems are available.
If you want to do some more testing without having to change queries. Have a look at the SDK components by Mike Howles. He created a datasource Design Studio SDK (1.4) - Datasource SDK Test
If you download that and install it you have the ability to change data frequently and you have more flexibility to prototype and test.
Jeroen