I need help with a discussion based on a case of a company

I need help with a discussion based on a case of a company.
Define corporate, business, and functional strategies and then discuss the differences among them.
Then read the Wal-Mart Case and using the assessment approach described in lesson 1 (review the PowerPoint on Assessment, pp:1- 15 p),
Discuss the Business Strategy and the Functional Strategies of Wal-Mart.
For each strategy state the following:
Objectives – Desired ends
Tactics – Steps (management decisions and actions) taken to achieve the objectives.