Depending on how you've created your data tables, you may or may not see a
Lookups folder. The Lookups folder contains tables that have automatically been
created for you. When you add a field, you can click the Options button to
specify a list of values that that field can contain. The values that you
specify are added to a new table in the Lookups folder. The field that uses
these values retrieves them from the corresponding table in the Lookups folder.
For more information on lookup fields, see Linking
Tables with Lookup Fields.