Originally Posted by
dduarte
I've fixed your family so you can use the array tool and get 1 or even 0 shelfs with no problem.
You can get an array to show only 1 or even 0 shelves by hiding the first and last element in the array beyond the extent of the open shelf area. It's a handy trick.
Tips:
1. Try to lock your geometry to reference planes and dimension to reference planes instead of your geometry.
2. Try to keep the Center (Left/Right) reference plane in the center of your families.
EDIT: fixed some things in the family.