Before editing the Products/Services from an opportunity, you can create, edit, and/or delete the info from the field, for that go to Administration - Administrator - System fields - Categories.
You must have administrator rights to make these changes.
- Select the Opportunity to make it the current entry.
- In the Details following tab; press the Edit icon.
- Locate Categories and select the drop-down list.
- Click on the item to add or remove it.
To add:
To remove:
- Click Save to finish.