Tips for Creating Targeted Account Lists in Clay

I am new to Clay and have been working my way thought Clay University. I was hoping for some tips about a specific prompt I want to create. I need have an account list created, but I want to filter them based on who they sell to. This is for a partnership motion, so I want software companies that sell to the same buyers that my company sell to. This includes Social media, marketing & communication, internal comms and employer branding teams. How would you tackle this and be sure to get reliable answers?