When creating category rule in Vault to assing to Content center parts most people use the IS Content variable for the rule. This variable is created for every part that comes out of content center and it is always set to TRUE. The fact that it is always created is a blessing and a curse. If you create a category rule alone using this variable all of your custom content center parts, or anything made with frame generator will be filed away under the Content Center category.
My suggestion would be to have Content Center create a seperate variable that matches the Standard or Custom options that are aviable to the Inventor user when making the part. That way the Vault category rules will file the parts correctly.
This border lines Inventor request, but affects vault usage so feel free to move it if necessary.