You should use a form to provide a place for users to enter
the criteria in text or combo boxes.  Then you can also have
a button on the form that's used to prepare the criteria and
open the report.  The OpenReport method's WhereCondition
argument can be used to filter the report's data without the
report or its query being aware of the filter.

Let's say you have two combo box's, one for customer and one
for area, then the button's Click event procedure would look
like:

Dim stWhere As string
Dim stDoc As String
stDoc = "nameofreport"
If Not IsNull(Me.cboNames) Then
    stWhere = stWhere & " And [Name]=""" & Me.cboNames & """"
End If
If Not IsNull(Me.cboAreas) Then
    stWhere = stWhere & " And [Name]=""" & Me.cboAreas & """"
End If
DoCmd.OpenReport stDoc, acViewPreview, , stWhere