Blue Iris

Hello all, I've been racking my brain for a bit on how to setup zone crossings so that I only get alerts when someone comes up to my door from the street. I have a separated garage that sit in front of the house and I don't want alerts when I go from the house to the garage as I do this several times a day. I've attached an image of what I'm talking about.

I feel like I should be able to say: If traveling from B-A-C then cancel the alert, but if traveling from A-C then confirm it. But as far as I can tell there's no way to cancel an alert based on zone crossings. I've tried to think about the logic needed to get this to work without a not function but I can't. Can anyone smarter than me able to solve the problem?

TIA

In theory A>C I use A>B that only works one way for me with an occasional hiccup..

Will that negate the crossing from B>A>C, or will it only confirm if the motion started in A then went to C?