From Bet Angel forum:
Q: Is it possible to create an automation file that can make a selection via the saddlecloth numbers?
A: Stall numbers are available in automation but not saddlecloth numbers. Saddlecloth numbers are available to Excel. If you wish to create some lucky saddlecloth number automation you can do it in Excel or start it in Excel.
Betfair api offers for horse racing runners metadata information that includes Age, ClothNumber, JockeyName, and so on.
Any of these metadata can be used in bot trigger script to selection your selection, as requested I used saddle cloth number. Here is the bot trigger script: