In Microsoft Access, a common need is to have multiple combo boxes or list boxes on a form, and to have the selection in one combo box limit the choices in a second combo box or listbox. For example, consider an Address form containing State and City lookups. When you select a state, you want the list of cities list to be limited the selected state.
This is known as cascading combo boxes or synchronized combo boxes.
We recently posted a tip and demo database containing a sample of species, both plants and animals, categorized by their taxonomic rank (kingdom, phylum, class, order, family, and genus). When you select the value “Animal” from the Kingdom combo box, the Phylum combo box is updated to only show Animal phylum. The Species list box is also filtered by your selection.
To learn more, read our page on Creating Cascading Combo Boxes and List Boxes on Microsoft Access Forms and download our sample database.