Hi Carlos,
You are right that it takes the first default page from the top folder, i guess you can move the halt code management up and then you will get access to that. I think if you mark the subcontract management folder as a link collection and the rest as service maps. That should do the trick. Then when you click the subcontract management wou will be presented with an overview of the contents of that folder. Then when you click halt code management it should start your default page.