so on your form you have created,
create a combo box
Select the combo box go into properties.
Data tab on properties, if you click row source. you can enter or make a query of the data.
Row source type. lets you pick, query/table, value list or field list
and bound column. tells access what column to bound to the form. IE what column is the data you want entered. then go to the format tab to adjust what you see.
Column count: enter the number of columns in the list. and column widths, how big is the width to show. IE.