Hi Randya,
For stores you can use Location code. For Sales, you can use Sales Analysis. In Navision 3.7, sales anaylese has to be done via G/L dimension which was very unflexible. With Nav 4, you can perform analysis straight off from Items.
For inventory transfer, if each store is setup as a location, you can perform location transfers using Transfer orders in Navision. You can even setup Transfer routes in Transfer orders.