A work-breakdown structure (WBS) in project management and systems engineering, is a deliverable-oriented breakdown of a project into smaller components. A WBS is a key project deliverable that organizes the team's work into manageable sections. Develop a Work Breakdown Structure (WBS) for a commencial building. The WBS must reach at least level 4 in terms of details using the indented format. Focus on the details of substructure instead of the superstructure. Bored piles are used as the foundation for the buildings. Open excavation is to be adopted for its construction. There is a 2-level basement in the buildings