Modules & VBA :: How To Add Another Combo Box To Filter A Field

I have some code in which I enter a startdate and a enddate into textbox's and a combo box where I enter a client name when I run the code it will show all record's generated with in the date range and same client name set in the combo box "cboclient" what I would like to be able to do is have another combo box call cboclient2 which will allow me to enter another client name so then when the report opens it will show me with in the date range set in startdate and enddate and filter the client field by cboclient and cboclient2 so for e.g.

startdate
01/01/14

enddate
11/01/14

cboclient
peter

cboclient2
steve

Run code show all record in date range and with client name peter and steve

Here's the code I have

Private Sub cmdPreview_Click()
'On Error GoTo Err_Handler 'Remove the single quote from start of this line once you have it working.
Dim strReport As String
Dim strDateField As String
Dim strWhere As String
Dim lngView As Long
Const strcJetDate = "#mm/dd/yyyy#" 'Do NOT change it to match your local settings.

[Code] ....