It can be done manually, but why bother when you can let a plug-in do the job for you?
Jari Williamson has created a plug-in called JW Tempo.
Take a look at it.
I think that it does exactly what you need.
You can find the plug-in at
Finale 2011c and 2012c, Mac OS X 10.8.4, Dolet 6 for Finale, Finale user since 1996