PriceGrabber needs to know the manufacturer and PriceGrabber category to put your products into. This information can not be deduced from the standard Actinic data.
The additional information must be entered as custom variables (in the same way that the information is added for other feeds e.g. Amazon or Googlebase).
Ideally the PriceGrabber Category must fit with their existing categories. e.g. Computers>Storage Devices>Hard Drives.
For information on how to set up these values for your product products (or sections) using the following articles:
The following article can help you do this for Actinic V8 and above:
http://moleend.helpserve.com/index.php?_m=knowledgebase&_a=viewarticle&kbarticleid=10
and for Actinic V7:
http://moleend.helpserve.com/index.php?_m=knowledgebase&_a=viewarticle&kbarticleid=40