I have been able to set the news provider for biodiesel.org to use the provider that nbb.org uses. That works ok ,however I need to have the classifications consistent between both sites. I cannot filter by category on the Biodiesel.org site. How do I use the classification provider and data for nbb.org on biodiesel.org?
You can change this behavior by going to Content -> All Classifications
You can see how many sites are using that classification (this is assuming you have v12.x as this was introduced around v9?) You can then change which site is sharing what classifications.
We are not using multisite. I use site A's news provider as the provider for news on Site B. But I need to have Site A's classification provider on Site B as well. These are stand alone installations.
"stand alone installations" - meaning that there is more than one codebase/multiple Sitefinity projects?