Say I have three kinds of items that I call A, B, and C. Now, I want to ask someone to create one. Which form is the correct one?
Create an item A.
Create an A item.
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If you want to ask someone to create one.
Create Item A
Create Item B
Create Item C
Because 'item A' is the name of the item.
Item A is used like a proper noun, e.g. John Smith. So create Item A is the correct construction.
It's like "Draw Tom, then Harry ", not "Draw a Tom, then a Harry." Create Item A, then Item B.
Do we want to create an 'A' of item (there could be an 'A' of variable or 'A' of parameter) or an item of 'A' (there could be other items)?
Because adjectives are rarely postpositive in English--they usually come before the noun--
Create an 'A' item.
implies we want to create an item of 'A', and
Create an item 'A'.
implies we want to create an 'A' of item.
The choice is yours.