You posted in a newsgroup devoted to supporting Microsoft Access tables and
db design.
If you question concerns doing this ("drop down lists") directly in tables,
DON'T! Although Access offers "lookup" data type in more recent versions,
you (and those who need to maintain the app after you) will find it is "high
maintenance".
The preferred approach is to use the appropriate data type for the primary
key of the looked-up table (?long int?), then use FORMS to hold comboboxes
(drop-downs). Do the looking up, by all means, but do it in forms, not in
tables.
Access tables store data, Access form display it.
Regards
Jeff Boyce
Microsoft Office/Access MVP