I have two model
1) Server Model : conneted to remote database which is stored on server
2) Local Host : connected to my pc database is stored in on pc.
You can launch multiple instances of WorkBench using the Terminal Application. Open Workbench as normal, then open Terminal.app. Run "ps ax | grep -i workbench", you should see a result like this: "11260 ?? U 2:34.86 /Applications/MySQLWorkbench.app/Contents/MacOS/MySQLWorkbench -psn_0_1823165". Copy this part, and paste it into Terminal, /Applications/MySQLWorkbench.app/Contents/MacOS/MySQLWorkbench and hit enter. That will create another instance. Open a new terminal tab, and do that as many times as you wish.