You can delete attribute values so that they are no longer included in an analysis.
Warning
Deleted attribute values can no longer be accessed. If you just want to hide attributes and their values and use them again later, use the Hide menu item in the Attributes tab and the Attributes dialog.
Procedure
Open the relevant item in the Attribute window.
Click an attribute value.
Press Del.
Click the Save button or answer the confirmation prompt when closing Attribute Editing by clicking Yes.
The value of the attribute will be deleted. Attributes that are specified automatically by the system cannot be edited. These attributes are highlighted in color.