Planning for a trip in Vancouver.?

Your best bet would be to take the skytrain to the Lougheed Mall, in Burnaby, then hop a bus to the Coquitlam Greyhound station (it's only about a mile) and then take the bus to Abbotsford. That's the only public transit that is going to get you that far. West Coast Express only goes as far as Mission, but another option would be to take the express to Mission and then hop a Greyhound Bus to Abbostford. Either way, you're going to go Greyhound.