Using the file manager you can delete existing custom prompt files.
Procedure
Using a web browser, log into the web management menus for the server hosting the voicemail service.
Click Applications and select File manager.
Select the VMProCustomPrompts directory.
Select the checkbox next to the prompt or prompts that you want to delete.
Click on the Delete icon.
To confirm that you want to delete the files click Yes.
The selected files are moved to the VMProCustomPromptsTrash folder and a marked as Archive files for automatic deletion at the voicemail servers next housekeeping.
After making any changes to the set of prompts, click the Apply Prompts icon. This copies all the prompts in the file manager VMProCustomPrompts directory into the Custom Prompts directory used by the Voicemail Pro application.