You have the following options:

  1. Add logic in your script to see which provider has content. If CNET doesn't have content, you can return the content from the other providers as backup. For example: http://demo.cnetcontentcast.com/BFP/scriptbroker.html (ccdemo / #ccdemo#). Disadvantage is a potential for delayed content presentation due to the script checking the content size.
  2. Setup the CNET product page script to either append or overwrite your existing content whether in-house or provided by another content provider.
  3. CNET can set up your script to avoid overwriting in-house content based on the presence of a tag or size of content.
  4. You can set up your preferred content provider on a per manufacturer basis. The caveat is if the manufacturer has different content elements serviced by multiple content providers.