Would you like to positively affect the cost and sales of an organisation/business? Attain the professionalism to cut costs and increase profitability with a Certificate in Purchasing Management. Purchasing Managers play the most important role of buying quality goods and services for the business or organisation within a required quantity and at the most competitive prices. Businesses and organisations today rely on skilled purchasing managers to make crucial purchasing decisions, as such decisions can directly impact the profit of a business or organisation.