Sorry, i didn't know exactly what to name my question.
What i need is to create a database for storing office items that will include Desktop computers, Laptops, printers, phones, etc. as ItemCategories.
I have a combo box on form to list all ItemCategories and run query by Item Category. Then the query result should show all the items, if say ItemCategory was Desktop computers then items returned by query will be all desktop computers.
On the other hand, i have a combo box for the user to choose ItemCategory when they are adding new items to the database. Other fields for adding new items are "Item make" "Item serial No." and "comment".
The experience i had was that each time i would add new item and choose the ItemCategory from the combo box, upon query the ItemCategory will appear in the combo box as many times as i had added new items. What i want is no matter how many times i choose the ItemCategory for new items the query combo box should only show a single ItemCategory afterward.
I hope my question has some sense. Please, advise. A Sample will be appreciated, too.