Currently the app works as follows: When you open the app you it has an icon for two companies. Tapping a company name takes you into the list of items for that company. If you tap an item in the list you can see the graph and historical data for that item. This all works great but we need to make changes to make it easier to add more items and sub items. So I want to stop using the Company, Item, Record tables and use just one table DataItem that references itself of child items.