If you go to

https://www.aua.com/at/eng/Flights/AirManager/Register/

you have three choices: log in (if you are a registered user); register (if you are not); or guest login, if you want to test the system.

I am not registered there, so I choose 'guest'.

The next screen again offers three choices: Regular Flights, Multi Availability or book by price.

If you choose 'Multi Availability', you get a blank form with six sectors. The default departure point is Vienna, but you can press 'reset' and change it. At the bottom of the form, you can choose whether your travel should be on Austrian Airlines group companies, on Star Alliance companies or on any airlines.

I have never actually booked through this engine, but I just tried a 'test drive' with six sectors on Star Alliance, departing from ARN and returning to CPH. It offered numerous possibilities, I selected the ones I wanted and it both planned the itinerary and calculated what the fare would be.

cheers,

Henry