To build a project management timeline, one must first create a project scope statement specifying the deliverables. Then develop a work breakdown structure by decomposing the deliverables into more manageable work packages. Each work package is then deconstructed into individual tasks, and dependencies between tasks are determined. The cumulative time required to complete each task is then calculated. Finally, a timeline is constructed by aligning tasks from beginning to end based on their durations and dependencies, and incorporating milestones to ensure completion.