For some Voice Bank, there are WAV folder in the installation DVD as the sample breath file.
Drag and drop the file onto [WAV(MONO)] track, or choose [Wave(W)] in [File] → [Import] menu.
Please note that some Voice Bank doesn't contain breath file. Please contact the distributor of the Voice Bank regarding this matter for the inquiry.
If you are unable to find a solution in the Troubleshooting section, please use the Inquiry Form to submit an inquiry.