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Given that this is the auto forum you might not get much help here. Try posting in the other Garmin forum here that covers the Edge models.
Trip planner can only accept 30 waypoints/viapoints whether sent directly from BaseCamp or created on the device. What your device and BaseCamp can also do is use shaping points, you can have hundreds of these between waypoints/viapoints. If you open Trip Planner on your device and then select a trip, shaping points are shown as small circles, sometimes depending on model with a line either side. Waypoints/viapoints are shown as flags. There is more info here http://www.poi-factory.com/node/45037
Your 1340 won't accept routes from any source, sorry.
What you can do though is to save the Google route as a kml file, import it into BaseCamp then send it to a device.