Once you have selected your desired colour you can define Product Information values by clicking on the Product Information button from the user interface prior to loading it in to your Revit Project.
The Product Information button is the button with the blue information icon located at the bottom right corner of the user interface.
On the Product Information dialog box you can enter additional values as required prior to loading in to your Revit Project as shown below.
When you go to the Materials Identity Tab on the Revit Material Browser you will see the Product Information data entered as per below.
Category: Paint