You can edit the settings for custom columns, whether they are currently active or not.
1. Click More in the project view and choose Customise project.
The Customise project dialog box opens.
2. Select the Column management tab.
3. Select any custom column in either the Available columns or Activated columns list.
4. Click Edit.
The Edit custom column dialog box opens.
5. Make the required changes. See Adding custom project columns for information on the available options.
6. Click OK to save.