If you sync with Intacct or Xero, you have the option to add Chart of Accounts to Items used on Bills or Invoices.
- Hover over the gear icon, and then click Settings
- Under Accounting section, click Preferences
- Click the edit icon
- To stop using this feature, select "No"
- Click Save
By default, "Yes" will be selected by default for "Show Chart of Accounts on Bills and Invoice Items".