The good part of that sheet is if you put your runners in and can't make a profit you can quickly change one or more as saver bets.

yes, can also choose to not bet on the race.

As you probably know anyway, I don't enter a thing, automation does it all, or most.
It's why I use the strategy of percents, such as the example of a pre-set Variable 80% of Target etc, because if one has a overall loss chasing strategy,
by the time it's on the 5th or 6th straight loss,
ouch !