Whilst Google Maps is 'ok' on my Android phone, I haven't found a way to create custom routes, I never let any device work out my route, why would you?
So it's Garmin and Mapsource for me all the time... plus decent maps to plot my routes.
Try this video, you can add as many waypoints in google maps as you need pretty much.
On a phone, search for your destination, tap directions at the bottom left of the screen, the next screen shows a box with your start location above your destination location, tap the three dots to the right of the start location box and then tap add stop you can then search for your next waypoint and keep adding them as required, once done you can change the order of stops just by dragging them up or down.
I hope that's useful
Chris
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