Use this dialog box to define which of the columns in the Family Table define a unique member of the content family.
 Adds a column to the list of key columns. Columns assigned as a key column display in the List and Tree View of the Size Selection dialog box. |
 Removes the selected key from the list of key columns. The remaining rows move up in the sequence. |
 Moves the selected row up, thereby bringing forward the key in the sequence. |
 Moves the selected row down, thereby pushing back the key in the sequence. |