Вы можете использовать RecordsetClone :
Private Sub cmdDelete_Click()
Dim rs As DAO.Recordset
Msg = "You are about to delete this record."
Style = vbOKCancel + vbQuestion + vbDefaultButton2
Title = "Continue?"
Response = MsgBox(Msg, Style, Title)
If Response = vbOK Then
Set rs = Me.Projects_subform.Form.RecordsetClone
rs.FindFirst "Bookmark = Me.Projects_subform.Form.Bookmark
rs.Delete
Else
MsgBox "No record deleted", vbOKOnly, "No changes made"
End If
End Sub