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Adjusting Shelve QTY in a designer cabinet with drawers and components above

Hello All.

I'm trying to adjust the quantity of shelves in a designer cabinet with an interior selection of drawers with components above. However in the sub-assembly I don't see an option to select the quantity of adj. shelves and even when I go to modify and to the prompt of sub-assembly under qty of shelves I see 4 but its grayed out and I can select it nor change it  . Please help :( !