you can also use group selection criteria (if you don't want to do this in a sql query as your source).
You need to create a formual to 'flag' the items you want to look for then sum the flag at the group level and use that result to limit your group results.
group on shipment number
create yuor flag formula
if {RECEIPT_DETAIL.ITEM_STYLE} = {?Item Style} then 1 else 0
sum this at the group levl
SUM(@flag,shipment_num)
use that in the group select criteria
SUM(@flag,shipment_num)>0
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