I am assuming that you are looking at the AS 9101 document, section 4.6.2, question 04?
"Does the supplier maintain a list of approved subcontractors and specify the scope of approval?"
I believe that it is requiring you to maintain an approved supplier/subcontractor listing (the results of your selection/approval/surveillance process) and that this listing must specifiy what they are allowed to supply in the way of products and/or services. As an example, just because a subcontractor is approved to supply you with nuts and bolts does not mean that you can use them as a plating or testing source unless their scope of approval includes those services too.
Hope this helps.
Does anyone else have a different interpretation?