The WBS field contains work breakdown structure (WBS) (WBS: A hierarchical structure that is used to organize tasks for reporting schedules and tracking costs. With Project, you can represent the work breakdown structure by using task IDs or by assigning your own WBS code to each task.) codes, which are alphanumeric codes you can use to represent the associated task's position within the hierarchical structure of the project. WBS codes are similar to outline numbers (outline number: Numbers that indicate the exact position of a task in the outline. For example, a task with an outline number of 7.2 indicates that it's the second subtask under the seventh top-level summary task.), except that you can edit WBS codes or apply a specific WBS format, or mask. WBS codes are also unique; you can only have one WBS code per task.
There are several categories of WBS fields.
Data Type Text (text field: A type of field whose content is text. Examples include the Task Name and Email Address fields. This field can contain up to 255 characters.)
WBS (task field)
Entry Type Calculated or entered (calculated or entered field: A field in which the value is determined by Project based on information in other fields. Information that you enter in the field yourself overrides calculated values.)
How Calculated The default WBS code is the task's outline number. You can type or define a format for your own custom WBS code. If you type a WBS code, you can modify it at any time. If you clear a WBS code, the field value returns to the outline number. If you define a WBS code format, or mask, Microsoft Office Project completes the WBS field with a value corresponding to the task's outline level and WBS code mask. You can only enter a WBS code that matches the WBS code mask you defined.
Best Uses Using the WBS field is most helpful if your company uses a specific WBS code system for project management. Add the WBS field to a task view (task view: A view that displays task information. Task views include three task forms; examples include Calendar, Detail Gantt, Gantt Chart, Milestone Rollup, PA_PERT Entry Sheet, Task Entry, Relationship Diagram, Task Sheet, and Task Usage.) when you want to display, enter, or change the WBS codes for tasks.
Example You have set up your project with the WBS code mask that your department uses, and you actually want to view and print reports (report: A format in which you can print schedule information that is appropriate for the intended recipients. You can use the predefined reports provided by Project or create custom reports.) that refer to the WBS codes with all tasks. You add the WBS field to the Task Sheet view.
Remarks To set up the WBS code mask, on the Project menu, point to WBS, and then click Define Code. Use the WBS Code Definition dialog box to set up the code mask for different levels and to enter any applicable prefix to the WBS code.
WBS (assignment field)