Detached Service - The status of men on detached service seems to have depended on how far away from away you were from your company's duty station. If you were physically separated from your company and doing duty, quartered, and rationed you were on detached service.
You would be on daily duty if you were doing work that any soldier might be called upon to do at the post were your company was stationed. You would take meals with your own company and be quartered in your with your company.
If you were on extra duty you would be rationed and quartered as on daily duty, but you would be doing work that a civilian employee would normally do, and you might be entitled to some extra pay.
This is how I understand these terms, and am reasonably sure of my definitions. This means, of course, that I'll be corrected in 30 seconds.