Record type subtab not visible on work order

We have a custom record type ‘Quality’ which is enable as a custom subtab on the item receipt by third party long back. However, This links to the custom record and works as expected. However,  I am asked to enable this subtab for the work orders as well. I went ahead and checked on the ‘Customise’ menu of the WO form to add the ‘Quality’ subtab on it. However, the tab does not show on any existing or new work order. Do I need to check something else as well to get this tab visible on the form?

Thanks in advance