Schedule Management > Creating and managing schedules > Defining tasks, milestones, and work breakdowns > Defining work breakdown
Using work breakdown structure codes
A work breakdown structure (WBS) is a way for managers to provide a quick reference to a task in the breakdown structure. This makes it easy for all those working on the project to find their assigned tasks and indicate the completion status of each.
The WBS code follows the schedule's tree structure, which shows the subdivision of effort required to achieve an objective. For example, a task with code AA/b.3 belonging to a schedule having format 2A/a.N.a and initial value AA, could have three subtasks with codes AA/b.3.a, AA/b.3.b, and AA/b.3.c.
Usually, large companies use an outline letter or number scheme for a WBS to plan and schedule the changes to a product. The format may even be company-wide.
Typically, the work breakdown structure format is set once and remains for the schedule's lifetime. However, the format can be changed for the existing schedule.
The codes for the schedule summary tasks are always generated. They can neither be edited nor saved. To start a subschedule at a code other than 1, a, or A, set the initial value in the WBS format.
Note: You must have Coordinator privileges to define the format of the schedule or set the codes for tasks. This functionality is available only in the rich client.
Source: https://docs.sw.siemens.com/en-US/doc/282219420/PL20251212545240207.plm00054/id989562 · retrieved 2026-07-10