Consider the main (and a selection of support) activities associated with the core business processes.
Support Activities of Dell Inc
Purchasing, Logistics and Shipping
It should not be centralized, and they have items which are obtained from a company's suppliers, shipments. They are retained until they are needed on the production/assembly line. Goods are moved round the organization. Dell relies mostly on its highly dependable supplier, where Dell simplifies its operation and relies on its computer monitor supplier to boat exactly to the customer.