I don't think you're going to get direct drag and drop between projects of different sample rates to happen by any method. SONAR only does sample rate conversion by File > Import or by dragging an actual audio file in from the file system (or via Media Browser). Unfortunately that won't preserve any non-destructive clip edits or take lane/loop structure stored in the source project, and you'll have to take care about timing if the clips don't all start at time zero.
 
Once upon a time, I proposed re-sampling files in the audio folder using a 3rd-party converter which causes SONAR to change sample rates automatically based on the rate of existing audio it finds in the folder. But it turns out that projects store clip length in samples so the audio ends up getting truncated when going from a lower rate to a higher rate and can't be recovered by slip-editing or any other trickery. Going the other direction pads clips with silence which isn't as big a problem.
 
Until the Bakers implement a project conversion feature, there's really no easy way to do this.

Hi,
This evening I discovered a simply way to change a project's sample rate. I had a old SONAR project with 44.1k audio files and needed to change them to 48k in order for the project to even playback at my audio interface's 48k sample rate. To change the sample rate you'll need an audio editing program like Wavelab, Sound Forge, or similar. I used Wavelab 6 and its Batch Process. It can also be easily accomplished by processing each audio file individually.
 
• In your SONAR project folder create a new file folder. No need to rename it yet.
• Launch your audio editing program and open the Batch Processing utility.
• Select all (44.1k) audio files from your project's 'Audio' folder and import them into the Batch Processor as the 'input' source.
• Select the new file folder you created as the location for the Batch Processed files to be save at the 48k sampling rate.
• If not using the Batch Processor, open the audio files in the audio editor and save them at 48k in the new folder.
• When complete, go to your SONAR project folder.
• Rename the project's 'Audio' folder to whatever name you like.
• Rename the new file folder containing the 48k files to 'Audio'.
• When you reopen your SONAR project it will be at the new sampling rate.
• Since the file names are exactly the same in the new folder, SONAR will recognize them and will maintain their original position in the Track View.
• A project's sample rate is dictated by the sample rate of the audio files that are in the 'Audio' folder.
 
I hope this help.
Good luck!
JON

Jon that`s the way to do it but first you have to make all tracks continiuas and add abit of silence to the end.
No bits and peaces on the tracks,otherwise you lose some sound from the end of each clip.
peace

Hi,
Thanks. I'll update my instructions to tell those to bounce the track(s) first.
 
I listened to your music on Soundcloud. Excellent work musically and with your production.
 
Cheers,
JON

You can also convert the files OUTSIDE of SONAR with any software that converts 44 to 48kHz.
When you open the project SONAR thinks that this is a 48kHz project.
Just go into the audiofolder and batch-convert all audiofiles. (Make a backup !!!)
 

I suck at this. I usually export it as the right bit depth and import it.
 
There is no fool proof useful way in Sonar IMHO. I've tried a bunch of tricks that should work, but they often don't work as you would think they would.