JoAnn,

I'd suggest creating a new table to store your services and the rates you
charge for them:
   tblService
       Service (Text, Primary Key)
       Rate (Currency)

Then, add a combo box, called cboService, to your form, and set its
RowSource as follows:
   SELECT * FROM tblService ORDER BY Service

Bind the combo box to the rate field in the form's underlying table. Set the
combo box's other properties as follows:
   ColumnCount: 2
   ColumnWidths: 2cm;2cm

Then in the combo box's AfterUpdate event, add the following code to
populate the txtRate textbox:
   If Me!txtRate = Me!cboService.Column(1)

Then add the same code to the form's Current event.

Regards,
Graham R Seach
Microsoft Access MVP
Sydney, Australia