How to set up a virtual joystick in the Thrustmaster T.A.R.G.E.T. software?

I recently bought two Thrustmaster T16000M flight sticks to play space games. However, there seem to be some games which are unable to differentiate between two devices of the same kind.

The T.A.R.G.E.T. software is able to map these two devices to one virtual device that combines all the inputs, which are a total of 6 axes, 32 buttons and an 8-way hat. I’m using the GUI application and I can see both the virtual buttons aswell as the hat, but I can’t find out how to map the two actual sticks to a virtual stick.

I read somewhere that it should be possible to do this with the GUI, so maybe I’m just not seeing it. Otherwise, I would be very thankful if someone could provide me a script which fulfills this task.