See if this helps. It was in the Help section on the toolbar. Just put in "insert excel document" in the search function.
Insert another file into an open document
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1.Click where you want to insert the second document.
2.On the Insert menu, click Insert File.
3.In the File name box, enter the name of the file you want to insert, or browse to locate the file.
Notes
•To insert only part of a document, click Range, and then type a bookmark (bookmark: A location or selection of text in a file that you name for reference purposes. Bookmarks identify a location within your file that you can later refer or link to.) name in the Range box. The document that you insert needs a bookmark assigned to part of it.
•To insert only part of a Microsoft Excel worksheet, click Range, and then type a cell (cell: A box formed by the intersection of a row and column in a worksheet or a table, in which you enter information.) range in the Range box.