You keep saying "save the renumbered tracks" when the files are already saved.
What it sounds like you want to do is rename them, which I said above, which you did not acknowledge in any way as being either correct or incorrect.
Just in case this is actually what you want to do...
Select the files
Right Click->Send To->Folder (Move)->Move Files To Organized Folder
Uncheck the "To Folder" box
Use <Disc-Track#> - <Title> (or <Disc-Track#> - <Album Artist> - <Title> or whatever your preference is) in the naming template
Verify in the preview that the files will be renamed as you specified. If there's just a file name and not folders in the "New Filename" column, they will be saved to the same folder where they started.
Click Reorganize