You want to insert text from another document into the document that you are working on, but you can't find the Insert File command.
The Insert File command has been renamed Text from File and moved to the Object menu on the Insert tab in Microsoft Office Word 2007.
Use the Insert tab to access the Text from File command.
Insert text from another file
Click where you want to insert the text.
On the Insert tab, in the Text group, click the arrow next to Object, and then click Text from File.
In the Insert File dialog box, locate the file that you want, and then double-click it.
Important: If you want to insert the header and footer also, be sure to insert the text from the file in a new section so that the header and footer are applied to only those pages.