1. From Setup, in the Quick Find box, enter Objects, then select Objects.
2. Select Tracked Field.
3. From the Custom Fields & Relationships table, select the Tracked Field field.
4. From the Values related list, click New.
5. Enter the value and API name of the field you want to track, and then save your changes.
6. From your approval rule, go to the Tracked Fields related list and clickNew.
7. Choose your tracking type.All Values: The approval rule creates a Tracked Value record for your tracked field every time the rule fires, even if the tracked field did not change. This also occurs if the Tracking Type field is left blank.Any Change: When your approval rule fires, it creates a Tracked Value record only if the tracked field changes.
8. All Values: The approval rule creates a Tracked Value record for your tracked field every time the rule fires, even if the tracked field did not change. This also occurs if the Tracking Type field is left blank.
9. Any Change: When your approval rule fires, it creates a Tracked Value record only if the tracked field changes.
10. Choose the tracked object.This is the object that contains your tracked field. By default, you can choose opportunity. If you want to track a field on a different object, add the object’s value and API name to this field.
11. Choose the tracked field.This is the field that the approval rule monitors for changes.