With Helium you can easily copy existing tags from one or more files to other file(s).
Helium will copy all tag information from the source file to the destination file and transform it to the destination tag format automatically when neccesary.
To copy tags, click TOOLS > Tags > Copy tags.
After that, add your source files (shown in the left pane) by clicking the Add button.
Add your destination files by clicking the Add button above the Destination files list (shown to the right)
You can reorder tracks as needed with the up/down arrows for each pane.
When all files are in order, click OK to perform the copying operation.