I was reading the help file section about Available Scatter Models in OpticStudio. Under BSDF Scattering:

A full description of the model and its use is provided in the Knowledge Base article entitled “How to Use Tabular Data to Define the Surface Scattering Distribution” also available on the OpticStudio web site. 

When I copied the phrase in the quotes into the search function on my.zemax, there were no results found. I then searched for just BSDF in the knowledgebase and found the article titled 'How to use tabular BSDF data to define the surface scattering distribution'. It was very surprising that by not including the BSDF term into the search query I was provided no results.