You appear to have made up your own syntax for objFolder. The following should be closer
Sub MoveToFolder(newmail As Outlook.MailItem)
Dim objNS As Outlook.NameSpace
Dim objFolder As Outlook.MAPIFolder
Dim SubFolder As Outlook.MAPIFolder
Set objNS = GetNamespace("MAPI")
Set objFolder = objNS.GetDefaultFolder(olFolderInbox).folders("Opportunities").folders("Customers")
For Each SubFolder In objFolder.folders
If InStr(newmail.subject, SubFolder.Name) Then
newmail.Move SubFolder
Exit For
End If
Next
Set objNS = Nothing
Set objFolder = Nothing
Set SubFolder = Nothing
End Sub