Microsoft Project contains many fields for storing information about the tasks and resources of your project. So much so, that it can be hard to imagine what else you would want to know.
However, there is usually a desire to create your own custom fields to display other information in your different views and reports. You can create your own fields to store text, dates, cost and other types of data.
To assist data entry, a field can be created with a drop down list. You can look up the value that you need in a list making data entry easier and more accurate.