I got you the first time, here I'll let you know what I meant and with the edits that you gave me (like no store owner, etc.)

Stores
- StoreID (P)(AI)

Products
- ProductID (ID to relate to other tables)
- ProductPrice (price to calculate the total of sales)
- ProductName (name of the product, like hotdog)
- StoreID (store where it is located, incase different stores have different stuff)

Sales
- ProductID (relative to product information, used to retrieve price and product name)
- StoreID (relative to which cart or store operating)
- SalesQty (number of sales for the day, this is automatically calculated from inventory counts)
- SaleDate (Date this sale record was created)

Inventory
- ProductID (relative to keep inventory of each product)
- StoreID (store/cart where the inventory record is for)
- InventoryQty (how much in inventory!)

Transactions
- TransactionID (P)(AI) (need a unique ID for each transaction)
- StoreID (store that the transaction was made for)
- ShippingtID (meant to refer to a shipment, which refers to which products were ordered)
- TransactionDate (Date the transaction was made)
- TransactionAmount (Amount of the transaction)

Shipping (this was for you, cause the supplies gotta get to the owner some how for him to sell them)
- ShippingID (P)(AI) (ID of the shipping record, and to relate which products where shipped)
- StoreID (Which store the shipping record is for)
- ShipDate (Date the shipment was made, or date the owner picks up his supplies)

ShippedProducts
- ShippingID (The id to the shipping record, which relates to the transaction records)
- ProductID (The product id that was shipped to the owner for him to sell)
- QtyShipped (how much of each product was shipped)

The only field that I truly think you can get away with out is shipping table, however you would have to change ShippedProducts's field names ShippingID to TransactionID to relate which products you sold to what transaction.

It is all needed. I have built a management system for inventory, daily cart sales, etc. for a catering company that does 70% of all their business off of events, static cart locations, etc.

This is the minimum that should be on any report, let alone used for information.

And yes, I will stick with you till the end, providing as much help as I can.