1. From your dashboard, hover over the left-hand menu. Place your mouse pointer here.
2. The tab should appear as illustrated below.
3. Click Settings.
4. Scroll Down, then Click Custom Fields
5. Click Companies
6. Click Add Custom Field
Data Management: Company - How to Add Custom Field
Custom fields allow you to store additional company information that isn’t included in the default system fields. Follow the steps below to add a custom field to a Company record.