On the Sheet List tab, right-click the sheet set node. Click
Properties.
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 set.
Click the name and the default value to enter the information for
these fields. To assign this property to the sheet set, make sure
that Sheet Set is selected under Owner.
Click the name and the default value to change the information
for these fields.
Click a custom property from the list. Click Delete to remove
the property.