Custom fields are one of Project’s most powerful features—using them, you can track, view, and report on a wide variety of information that Project stores but either doesn’t make visible to you by default or doesn’t present in quite the way you want. When would you use a custom field? You can use custom fields, for example, when you want to:
Create lists from which to select values to ensure accurate data entry,
Store additional data about a task or resource,
Create formulas to perform calculations on data, and
Insert icons that present information graphically.
In 7, for example, I present an example of creating a resource-oriented custom field to track budget resource information. Before you dive in and start defining custom fields, ...