Login to the Website

Go to Dashboard or Admin > Publishing > Folders

Select the Folder of the menu item you wish to link to a document

Create a default article under the folder if not already created

Complete the Require Attributes of the article

Under the Optional Attributes section expand the section "Content Type and Stylesheet".

For Content Type select "Link to a Document (doc, pdf, xls)"

For Link to Document select the document (Please Note the Document will need to be uploaded into the Base folder for it to be selected on the drop down list).

Tick the Box "Open in new window" if you would like the document to open in a new window.

Once you have completed this click on "Publish"