Where to start
Start with the count. Put purchasing, store and warehouse stock, replenishment and fulfilment in Supremacy Inventory & Manufacturing so head office, the stores and the warehouse read one number. Add Finance when supplier payables and expenses should sit in the same workspace, CRM when trade, corporate and franchise accounts need one history, and HRMS when store staff records outgrow spreadsheets. Your point-of-sale stays where it is; the back office moves. One store and the warehouse can go first, with the rest of the chain following once their counts hold.