How to Find Customer Service Roles in North American Companies

Hi all, i am trying to find the number of people in the customer service function in companies that are 10 to 500 size which are in north america and are in industries like fintech, insurance, real estate, consumer services, other consumer businesses. I assume some command or a combination of commands will allow me to build a column that has the number of customer service professionals in that company. What would be the best way to accomplish this?