I don't have a link specific to that but we have done it several times. I do this when we leave for an afternoon break or you can do it when you are still at the park. I book a fast pass for when I know we will be back at the park and then I set a timer to alert me when the time will be for me to book my next fast pass. At that time I book one that will be available after we would have already been able to ride the first fast pass. Set timer again. Rinse, repeat until back to the park. This is normally fairly easy to do as the fast pass windows tend to get later and later for the rides as the afternoon/evening go by - however, you can find yourself unexpectedly being able to book a cancelled fastpass for a ride that will fit in between two you already have - which is a nice bonus!!
Hope that helps some.