To Select a Link Set from the Configured Libraries or the Active File

In the Links tab of the Project Explorer dialog, click the Manage Link Sets icon to the right of the drop-down list box.

The Link Sets dialog opens.
Click the arrow to the right of the drop-down list box.
The three sources of link sets are displayed.
Do one of the following:

Select Configured Libraries as your source.

or
Select Active File as your source.

The link sets in the selected source appear in the list box.
Double-click a link set in the selected source.
In the Project Explorer dialog, the link set's name appears in the drop-down list box and its links appear below its name.