ive exported some of my horses to the race builder. when i reset their form and rating do i have to do it for the jumps and the flat? also is it possible my horses (flat season) will do well going over the jumps or does it not work like that?
just wondering coz my best game horse is awful in the race builder, worse by about 6 seconds

You can transfer your horses between codes during the season, I think you can do 6 transfers each window. Just to cover all bases reset the chase and hurdles mark 100 for your flat horse just incase you switch codes ect. Dont worry about times in the race builder, your best horses are your best horses, just make sure you do a few trials at different tracks on different goings when selecting your horses. Exporting a pace-maker to race builder may improve your times.