Isolating rows when grouped and summed

D

dvcas

What is the easiest way to isolate rows in a single table, which are an
grouped by an item then by a sub item, but only when the sub item sum is less
then 0.

123-item
1234-sub-item 10
456-item
4567-sub-item -10
4567-sub-item 10
567-item
345-sub-item -10
345-sub-item -10

so I would only want 567-item with 345-sub-item to be displayed.

Thanks in advance.
 
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