Prioritize files in vector store

Hey Guys,
Right now i am doing a testcase with a chatbot:

I have a Vectorstore with dosen of manuals of cars.
When i start a chat, i select the car brand and type for context.
Is there way to say to the assistant that file X in the vectordb is more related than the other manuals(other then the content brand/type similarities)? Or what should is the best practice for questions like this?