Line up a draw number with it's vtracs like this:

178=623 ..  from those pick your combos..  178 being the last number drawn..

                        623 being the vtracs of it... 

                        either use  1-6 position 1

                        either use  2-7 position 2

                        either use  3-8 position 3

These combos should be boxed when played..