why do you post this here? post it in musicians discussion or andy sneap's forum
that said, why do you want to eliminate snare in the overheads? if you think you need to do that you're probably doing something else wrong. try placing the overhead mics somewhere else if you need to reduce snare in overheads, but generally (at least if you want a reasonably acoustic sound and aren't planning to trigger everything) i like getting a lot of snare in the overheads and using the actual snare mic only as reinforcement and tone shaping. lots of the snare sound will come from the overheads, there's nothing wrong with that
"eliminating" snare sounds from overheads is NOT going to happen whatever you do because snares are all over the place freq-wise, they have a lot of information all over the mids and far up into the high frequencies where cutting will damage your cymbal sound severely.