How to place portal values into a field?

[ML2008]

I have a portal with units belonging to a company, every company has one or more units in the portal. How can I define a field to show all the company units in the portal?

[MarkWilson]

Create a value list showing only related values from the "Units" field.

Create a unstored, calculation field =

ValueListItems( Get( FileName ) ; "UnitsValueListName" )