Using Clay AI for Targeted LinkedIn Searches in Sales Navigator

Hi folks. I have not found a specific guide on how to use Clay to find specific persons in the sales nav within the company using Clay AI. I created a list of companies and got their domains and LinkedIn accounts. Then, I would like to use AI to search companies on LinkedIn and find very specific positions within those firms. Usually, our targeted companies have multiple, often over 100 people with business dev titles, but we need very specific segments they take care of, for example, neurology business development. It is easy to find them in the sales nav, but I would like to automatize that search process. Is there any guide on how to extract such people? Thanks.