Under each respective Client, the ability to add "Client Type" and select from the options (which are added under Settings just like "Job Types."
Examples:
Client Type -
  1. Insurance
  2. Property Management
  3. Attorney
  4. Plumbing Contractor
  5. General Contractor
  6. Municipality
  7. Architect
  8. School
  9. Restaurant
  10. Hotel
This would help sort Clients for marketing, data, etc.