I attach a screen dump of the info I think you are referring to. Perhaps we could have variables called Jockey, Trainer, Age Weight, Form_[digit from right], Days since last ran.
then you could write a trigger such as :
Back, Any Selection if:
Jockey contains Eaves
And
Age > 2
And
Days since last ran < 10
And
Form_1 < 3 (ie better than third last time out)
etc
etc
Is this what you meant ?