Seems like a simple task/question?  I need to copy all the audio from one project to another, the old project is 44K the new is 48K.  If I try and copy-and-paste it won't let me because the sample rates don't match.  I tried opening both projects at once to see if I could drag-and-drop but can't figure out how to get both track views floating?  Is there a way to convert an entire project to a different sample rate?
 
If I have to I can export all the audio and import but it's a lot of tracks and I'd like to know for future anyway... thanks!

Personally, if I'm bringing audio files into Sonar I first open them in Sound Forge to check that the properties match my project.

If they don't I then use the tools available to edit the properties to suit.

I thought that if the properties did not match that Sonar would do the conversion, but perhaps I am wrong about that.

The reason I do the conversion outside of Sonar is I don't get a copy of the audio files.

Cheers

andy

Right but let's say you have a project that has 25 audio tracks and in those tracks you have 300+ separate clips.  If both files were the same sample rate I would select all the audio and hit copy, paste it into the new project, easy.  OK I can bounce down all the clips as 25 audio tracks but still have to export/import them all?
 
If I take a file from the media browser and drag it into Sonar it automatically converts it to the correct sample rate, I'm looking for a solution like that...?  You are correct that Sonar will do the conversion, but apparently not if you cut-and-paste.

I don't often work with mis-matched sample rates within a project but when I do and / or if I have a problem I will typically Export them like so:
 
Select an audio track or tracks and use the File > Export Audio command to open the Export Audio dialog box.
Use the Export settings to change the sample rates.
 
After export is complete, remove the problem sample rate tracks and open the browser.
Use the browser to navigate to where you exported the files and drag them in to sonar 1 at a time.

Go to window/arrange in columns (or rows) with both projects open. Close the browsers and inspectors for more screen space. This should give you two track views and let you drag/drop.

By your example of what you want to do, the difference between 48 & 44.1khz is not very great.

To increase a sample rate you have to add "nothings" to fill the space. It may serve you purpose more easily to take the 48khz track and bounce them down to 44.1khzandthen import all the files into one 44.1khz project.

It's a lot less technical and you will add very little unwanted noise.

Sanderxpander
Go to window/arrange in columns (or rows) with both projects open. Close the browsers and inspectors for more screen space. This should give you two track views and let you drag/drop.

This is what I was looking for... I couldn't figure out how to "unfloat" the track view to see both projects.  But... unfortunately Sonar still won't let me drag-and-drop between the two files.  Thanks.
 
I appreciate the help from the rest of you but I was hoping to find a way that doesn't involve exporting and importing the tracks individually.  Maybe it's not possible...?

You can't unfloat the track view but using the previous instructions you should have two track views, one above the other showing tracks from each project. Drag and drop should work but if it doesn't, close Sonar, right click the Sonar icon and select Run as Administrator. This is sometimes necessary to be able to drag and drop.

mudgel

To increase a sample rate you have to add "nothings" to fill the space. It may serve you purpose more easily to take the 48khz track and bounce them down to 44.1khzandthen import all the files into one 44.1khz project.

Sounds like some confusion between bit depth and sample rate. To increase bit depth from a lower to higher size, you add zero bits to the least significant end. To decrease bit depth you throw away/truncate the data at the least significant end. But re-sampling requires that you recalculate new values for all the samples of the waveform that is represented by the original sampling. You cannot even just interpolate new values between the existing values if you want an accurate representation of the new waveform. And if you remove intervening samples altogether, it creates the same problem as if you get dropouts when rendering, in the extreme case clicks and pops.

No confusion just poor explanation.