You wrote that it is an unbound combo box. I will assume
this means it is supposed to be unbound. You can populate
other fields by adding fields to the query or table that
is the combo box's row source. It would have been easier
to answer had you given any indication of any details at
all about the database, but absent that I will pretend you
are selecting a customer name and you want the address,
etc. to appear in text boxes elsewhere on the form. I
will call the combo box cboCustomerName. You say your
combo box is based on a table. If your table fields are
CustomerID, CustomerName, CustomerAddress, etc. in that
order, set the combo box's Column Count to 3, and the
column widths to 0";1.5";0". Set the record source of the
address text box to =cboCustomerName.Column(2). Column
(2) is actually the third column. The first column
(CustomerID in this case) is Column(0).
Consider basing the combo box on a query that includes
only the necessary fields.
If you want to select an entire record based on a combo
box selection, use the combo box wizard to get yourself
started.