Hi everyone. My song is a song with portions of the song with different tempo and style. So what I did was, I've recorded them in a few different projects with their own tempo and style since I've yet to learn how to change various tempo just in a single project. So as stated in the title above, how to put them together in a single project before doing further editing etc. What's the better way to do this? Thanks everyone. All the best, God Bless.

If you mean your song changes tempo throughout it's length it's easy to either set this up in your project, or to export the audio from your sub projects and import into the "Master"

If you mean you want certain tracks to have a different tempo but playing at the same time then Sonar can't do this - the only workaround i can think of is to do the export > import suggested above

But seriously, if it's the first situation, you are much better off doing this inside your master project - inserting tempo changes is ridiculously easy