The way I understand a multi-value list  is that the values  are entered  when
you are setting it up.

During the New profile  Wizard, you will be asked to select the properties  of
the profile. If you hit New, it asks you for the name and TYPE. This is
where you select Multi-value list and hit the values button to the right.
Then you enter the values you want displayed. You can select the box
allowing users to enter other values, but it only affects the doc they are
working in and saves them within the doc. Not your overall list. That is
kept within the profile.

Hope that's what you were asking.