>Interesting that you and Rich see it differently. No wonder I am confused :).
>Thank you.
>
>>Used means how MANY were used
>>Usage means HOW they are used
>>
>>
>>>I am trying to decide which word is better for the title of a feature. The purpose of this feature is to record that a certain quantity of a part was removed from stock (used to maintain an equipment). And I need to come up with the caption for the menu item for this feature. My choices are: "Post Parts Used" or "Post Parts Usage"
>>>Which one is better?

Wiktionary is your friend

usage (plural usages)

1 The manner or the amount of using; use
2 Habit or accepted practice