On the Sheet List tab, right-click the sheet set node.
In the Sheet Set Properties dialog box, click the Edit Custom
Properties button.
In the Custom Properties dialog box, do one of the following:
Click Add to create a new custom property for the sheet. Click
the name and the default value to enter the information for these
fields. To assign this property to the sheet, make sure that Sheet
is selected under Owner.
Click the name and the default value to change the information
for these fields. With this method, you can change the value for
every sheet in the sheet set.
Click a custom property from the list. Click Delete to remove
the property.