>I've done this in the past with one form. A drop down allows the user to select the lookup table to maintain, then a grid is used for the items in each lookup table.

That's called a One True Lookup Table. Joe Celko and others believe that is an inelegant design.

>
>>I was wondering of what do you think of a menu with long list (18 items)?
>>
>>I have 18 lookup tables in the application. And I need to provide user with ability to maintain these tables. Each table has a form (with Edit/Delete/Add,etc.). So I am thinking of having the following tree on the main menu:
>>File -> Miscellaneous Table Maintenance -> Table 1, Table 2, and so on.
>>
>>Is the above reasonable; to have 18 items on the menu? TIA.