You need to use the mapping to the virtual control unit. In BTSV, combine two control unit into one virtual control unit, and the channels below the control unit will be displayed on the control unit.
Enter BTS8.0 software, click to enter the display Settings in System Settings, and select "Display device type (BTS80 BTS81 BTSV...)". Then right-click BTSV to add a "new virtual control unit".
