The author of that workbook has some instructions in
sheet named: Retirement Staking Plan
put cursor over cell B2 and a message thingy will open up with instructions.

I guess many here with VBA experience will have their own method/s of automating the repetitions, dates, etc etc....
I'm hoping to work out not just one selection, but a series of "hedging" 3 selections.
So if let's say my best 3 per race is A,B and C, there be separate staking plans.
The reason is, I usually get winners and loss streaks in those "best" 3 selections.
Example:
SR 1
RSP:A, TAB Runner: 5 L
RSP:B, TAB Runner: 7 L
RSP:C, TAB Runner: 10 (won)

MR 2
RSP:A, TAB Runner: 1 (won)
RSP:B, TAB Runner: 8 L
RSP:C, TAB Runner: 5 L

and so on..,
Someone with a database can quickly code up a 'what if" with past results to see if this may work using 5000 races would be appreciated.