I am working on a composition that is initially in a variety of meter changes 6/4, 4/4, 3/4.  The quarter note stays constant  - quarter ='s 96.  Then it changes to 2/2 where the half note ='s 72.  I don't understand how to change from the quarter designation to the half and change the tempo.
 
Any help appreciated.

Go to project>insert meter/key change, and project>insert tempo change, add the changes at the required bar/measure in the piece. That's how I'd do it anyway.

James has you covered on changing the meter. For purposes of setting tempo, a 'beat' in SONAR is always a quarter. So for 2/2 at a half=72, you will need to set a tempo of 144 in the 2/2 section.

Hi! I have a similar situation, as I recently recorded a singer playing guitar and dragged the whole song to time ruler for ARA tempo extraction. Despite it did a good job, the tempo is half of what it should be. In other words, the metronome sounds more like 4/2 instead of 4/4 (the current time signature). 
 
However if I set time signature to 8/8 metronome will mark tempo fine, but I'd like it to be in 4/4.
 
Is there a way I could keep the tempo map and make metronome mark as written above?

Thanks!