Segmenting Studies for Improved Chat Feature Data Retrieval

In an effort to get the chat feature to return more useful data, I need help segmenting various studies. to add context, I do a variety of studies such as benchmarking, discovery, usability and concept testing. The issue I run into is that when asking a question, that would go across various studies, like "what do people think of the images" I dont want the system to look at concept testing studies because those are not relevant. Is the solution to this a Field in the system to identify the type of study. Also, how do i prevent old findings that are out of date from showing in the chat feature? I would assume a date filter but not sure.