I want to take a mix WITH the click to a buddy's for an overdub.  In X3, is that possible?  How?
 
Thanks!
 
Markie D

Bounce click bus to external wav. Drop in in the project. Export a mix.
 
Maybe that would work but you need play click enabled (not record click).

I pull up piano roll and insert four quarter notes in a measure and then assign it to a rim shot.  I then turn it into a groove clip and stretch it the entire length of the song.  I also normally pan it hard right and the rest of the tune hard left - for a drummer who may or may not want to play to a click.

Are you sharing Sonar projects files? 
Or are you just exporting a stereo wave. 
The metronome has output options. 
The default is to the sound card directly , change it to the Master bus. 
It can be included in an exported mix etc. 

This is one reason I prefer tagruvto's method, creating my own click track rather than using the metronome. That way, it's just another track in your project that can be exported alongside any subset of tracks you want. Great for collaborations. Plus you can insert cues such as fills to help you anticipate changes while overdubbing, something a metronome can't do. 
 
Even though you haven't done that for this project, you can easily add a click track before sending it to your collaborator. Like tagruvto suggests, just add a MIDI track, open the step sequencer and create a 1- or 2-bar beat. That'll make a groove clip that you can stretch out to the length of the song. Route it to the TTS-1 or a drum sampler and freeze it. If you want to insert cues, right-click on the groove clip and select "bounce to clip(s)", which will convert it into a standard MIDI track that you can edit.
 
 

bitflipper
This is one reason I prefer tagruvto's method, creating my own click track rather than using the metronome. That way, it's just another track in your project that can be exported alongside any subset of tracks you want. Great for collaborations. Plus you can insert cues such as fills to help you anticipate changes while overdubbing, something a metronome can't do. 
 
Even though you haven't done that for this project, you can easily add a click track before sending it to your collaborator. Like tagruvto suggests, just add a MIDI track, open the step sequencer and create a 1- or 2-bar beat. That'll make a groove clip that you can stretch out to the length of the song. Route it to the TTS-1 or a drum sampler and freeze it. If you want to insert cues, right-click on the groove clip and select "bounce to clip(s)", which will convert it into a standard MIDI track that you can edit.

I've been doing something similar for years for our backing tracks. We use a castanet patch for the click, drummers love it, they can always hear it because it has a very sharp attack. We use a sine wave beep G beep for cues.
I do it a bit differently though. I bounced 4 castanet clicks to a track, trimmed and looped it and dragged it to the audio library. Anytime I need to add a click, I just drag it into the project and extend it.

But if your giving your friends the project as a CWP, you don't need to include the metronome.
And I think you can use that universal OME? for other DAW's   and this works too.
All DAWs have metronomes and if there's any midi in the project then there is a tempo and therefore it will drive their metronome. 
That's why I asked our OP if this was a WAVE mix. 
You can even export multi track and include Sonars metronome as it's own track I believe. 
Seem's they have wandered off anyhow.