combobox help

Question

so what im trying to do is load anther form called frmPacific when a user chooses pacific_instruments from a combo box

So what i have is a combo box on the main page, the drop down items of the combo box is as follows  Pacific_Instruments Daytronics, Kinetics, etc
each choice eventually will have its own windows that the user must config. But I don’t know how to code so that different windows show/load upon the choice the user takes. Any help would be greatly appreciated, thank you.