I have some tracks, which in some measures they must be associated with a bus and other further measures they should be associated to a different bus.
I wonder if it is possible to dynamically change the bus for a track?

Create two sends for the track, feed each one to the appropriate bus, and then automate the sends or bus outputs (depending on the situation). You could also feed the two bus outputs to another bus or aux track if you wanted to automate the overall bus level, regardless of which bus was selected. The same technique would work with Aux Tracks.

rogeriodec:
 
Assuming audio tracks, maybe this will work:

• On each track that needs to be dynamically routed, place a send to each bus to which you will want to route the audio during your piece
• Use automation on the Send levels added to each track to "move" the output from one send to another at different parts of the piece

Hope this helps,
Paul

Thank you very much!