Case's Name

For Vbazi, to find a way to express meanings like "orange juice", "milk
coffee", or "apple pie", I've invented a preposition that is a "preposition
of composition" that works like "juice PREP orange" and "coffee PREP milk".

Is there a name for the case that the modified noun is in? I've searched a
few case lists and been unable to find something like this.

Can Someone help me?

- Max

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