The following code was built with the command wizard & works great, however,
I need to add addtional code to filter with more content.  Currently, when
the command button is clicked, it opens the form based on the Plan and
Product chosen.   The user will also have to choose the location, effective
and term dates as well to drill down to the form they wish to view.  How do I
add code to include these items so when the user clicks the command button,
not only will the form open to the correct plan and product, but to the
matching location, effective and term dates as well.  
Thank you for your help.

Private Sub cmdClickforContractInformation_Click()
On Error GoTo Err_cmdClickforContractInformation_Click

   Dim stDocName As String
   Dim stLinkCriteria As String

   stDocName = "frmContractRates-Specifications"
   
   stLinkCriteria = "[ProductId]=" & Me![cmbProduct]
   DoCmd.OpenForm stDocName, , , stLinkCriteria

Exit_cmdClickforContractInformation_Clic:
   Exit Sub

Err_cmdClickforContractInformation_Click:
   MsgBox Err.Description
   Resume Exit_cmdClickforContractInformation_Clic
   
End Sub