Assign work products and documents to a WBS element from the Work Breakdown Structure window

Select the WBS element.
Display WBS details, then click the WPs & Docs tab.
Click Assign.

To display the WPs & Docs tab, right-click in the Details area and choose Customize WBS Details. In the Available Tabs section, select WPs & Docs, click , then click OK.
Select the work products and documents you want to assign, then click the Assign button. You can select only work products and documents that were created for the project to which the WBS element belongs.
Click .