Need help with creating project budget - MS Excel

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Prepare the budget in Excel using your project WBS and make sure to include a report name, your name, and date.
Include a tab for the WBS and a tab for your budget. Submit 1 file with both your WBS and Project Budget.
Your WBS must be comprised of at least three levels with a minimum of five (5), Level 1 tasks, two (2) Level 2 tasks, with three (3) Level 3 tasks.
Continued to decompose the tasks/activities in your WBS until you have tasks which are small enough to assign to an individual and accurate estimate the cost of each activity.
You must use the Excel math functions when you create your report, for instance, =sum(A3*A5).
Do not "hide" numbers in formulas, for instance, =sum(A3*330), where 330 is a cost.
Include all project activities. Recall that we are rolling up the project