One way would be to target the first qualifing selection one comes to for each meeting.
e.g. one selection for each qualifing venue.
e.g. 4 bets for 4 venues.

What one will usually find is that the shorter priced horses seem to pop up in the first half of most meetings.

Another way is to only bet your selection if it is also one of the 3-4 UniTAB selections, usually after 10.00am. That's if that suits ones time schedule with work.
This should weed out a few duds. You may miss a few also ,but not many.

Cheers.

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Cheers.