I would cheat like this in the amount box ...

IF(AND(sel_order=1,lay_price<2),fav_stake,0) if all conditions not met then zero

copy paste and expand ..

IF(AND(sel_order=1,lay_price<2),fav_stake,IF(AND(sel_order=1,lay_price<2),fav_stake,IF(AND(sel_order=1,lay_price<2),fav_stake,IF(AND(sel_order=1,lay_price<2),fav_stake,0))))

origonal condition pasted into zero to expand.

IF(AND(sel_order=1,lay_price<2),fav_stake,IF(AND(sel_order=2,lay_price<4),second_fav_stake,IF(AND(sel_order=3,lay_price<6),third_fav_stake,IF(AND(sel_order>3,,sel_order<11,lay_price<20),mid_fav_stake,IF(AND(sel_order>10,lay_price<50),outside_fav_stake,0)))))

edit carefully as necessary.

if all conditions are not met, amount will be zero and no bet will be placed.

make *fav_stakes constants for easy setting of amount . Also note it is possible to lay the whole field (or close) if "all matching selections" in selected and no other filters are applied.

I have had up to 10 IF's .. very messy if you have to edit something, but works very well too.

untested in MFP, just typed it here so double check syntax and test run.