Change code to open form AND subform at record number

[Garindan]

Hi all, I currently have the standard code on a command button. The form holding the command button shows customer comments and its record source has both fields - 'CustomerNumber' & 'CommentNumber'.

The form which the button opens has a main form and a subform. The main form has the 'CustomerNumber' field, whilst the subform shows comments for that customer and has the 'CommentNumber' field.

How can I change the code to open the form at the correct 'CustomerNumber' and also the subform at the correct 'CommentNumber'?

Private Sub btnOpenCustomerForm_Click()
On Error GoTo Err_btnOpenCustomerForm_Click

    Dim stDocName As String
    Dim stLinkCriteria As String

    stDocName = "frmCustomerSearchDataEntry"
    
    stLinkCriteria = "[CustomerNumber]=" & Me![CustomerNumber]
    DoCmd.OpenForm stDocName, , , stLinkCriteria
    DoCmd.Close acForm, Me.Name

Exit_btnOpenCustomerForm_Click:
    Exit Sub

Err_btnOpenCustomerForm_Click:
    MsgBox Err.Description
    Resume Exit_btnOpenCustomerForm_Click
    
End Sub

I imagine its something like...
stLinkCriteria = "[CustomerNumber]=" & Me![CustomerNumber] & "[CommentNumber]=" & [Forms]![frmCustomerSearchDataEntry]![fsubCustomerComments].Form.CustomerNumber

but I get confused referencing subforms

 

[Garindan]

Can anyone help with this? Thanks