Unsure if PivotTable is the correct feature

I'm trying to reorganize the masterlist of all of my supplies so that they show up dynamically under the categories they belong to.

So that instead of having:

CAT1 SUBCAT1 ITEM1
CAT1 SUBCAT1 ITEM2
CAT1 SUBCAT2 ITEM1
CAT2 SUBCAT1 ITEM1
CAT2 SUBCAT2 ITEM1

I have

CAT1 SUBCAT1 Item1
Item2
CAT1 SUBCAT2 Item1
etc.

For the most part PivotTables seem to accurately perform that task, but I don't seem to be utilizing either the column or data fields. This made me think that perhaps it would be better to perform this task with another feature, or that I wasn't fully utilizing the PivotTable abilities. I intend on adding in the QTY of each individual item; however, it seems that doing so creates an undesired column effect.