If anyone wants to follow a staking plan like this there is a simple maths formula that works well and would return similar results if you were doing it manually.

Using a standard parlay bet of 4 selections there are a total of 11 bets involved.
6 Doubles
3 Trebles
1 4 horse all up

For $10 units this would be $110

If you selections are in different races you justs need to place 60% of the total on each selection.
EG

$110 = $66 remainder is $44

After the race you add all returns plus the remainder to give you a new parley amount.

Using the above figures if we had a place runner paying $1.50 x $66 return = $99

$99 + $44 = 143

The next bet would be 60% of this amount $86 adjusted with remainder $57

If you have a loss then the new bet would be 60% of the remainder.

Try this out using a 4 horse parlay with both methods and see how close they are.