Need Help Filtering Contacts by Specific Companies in Database

Hi all, quick question. I'm trying to create a list of colleagues from a list of contacts in our database. We only want to find people at the companies we have in this list. When I tried sourcing 'find people' using the table of companies, it seemed to just use the table as a starting point and not boxing the results to just the companies we listed. I tried asking Sculptor, but it gave me the same approach I already tried. Any suggestions?