1. Add new invoice / bill (or click to edit)
  2. Click on the Additional info button on action bar to add new field 
  3. Choose the Field name from drop-down list or key-in your own field name and press ENTER
    • The description will be saved automatically for repeat use
  4. Fill in the Field Details on the right
  5. Tick the checkbox at the end if you want to print this in your Invoice. Otherwise, untick it to hide from printout.