Consider using a complementary field called Department or Role which allows you to categorize the dozens of job titles that can all under one department or Role (Executive, VP, Principal, Director, Manager, Rep, Associate, Influencer) , yet still allow for reporting or use in segmentation for lists or emails. Departments can include: Sales, Purchasing, Accounts Payable, Marketing, Operations, Project Management, Executive, etc. Occasional clean up can be performed by exporting the Job Titles, review for departments missed, and categorize those that have not been assigned to a department using a bulk edit.