You can use a listbox with its Multi Select property set to Simple or
Extended. If you want to store the selected values, you will need code to
so it since a listbox can only be bound if its MultiSelect property is set
to None. Remember, it is poor practice to store multiple values in a single
field so to store selected data, you really need to work with a many-side
table.
The link below shows how to use a multi-select list box to filter a report.
There are other ways to use a multi-select list box, but it is not possible
from your brief question to determine your specific needs. http://allenbrowne.com/ser-50.html
