Starting with the vSphere Image Builder 5.1, there is a cmdlet
Remove-EsxImageProfile to remove an image profile. The command and its syntax remain the same with vSphere Image Builder 5.5 as well.
The following procedure will guide you through the steps required to remove/delete image profiles:
Get-EsxImageProfileto list all the available image profiles.
Remove-EsxImageProfilecommand to delete the image profile:
Remove-EsxImageProfile –ImageProfile "Profile001"