Adding a key:
Select the key field of the relevant security.
Type in the name of the key you wish to assign.
A key may be any combination of characters, but it must be unique to an
individual security.
Removing a key:
Simply select the key that you wish to remove
and delete it.
You will not be able to delete keys of securities
on which other securities are dependent. In the example below, the key
'a' may not be removed, while both 'b' and 'c' can be deleted.