Its possible to create the rows you are looking for but I am not aware of a way to create the "groupings" in excel. You wouldnt be able to collapse the rows. But to get the subtotals. you would branch your data off with a summarize tool grouped on your Composite, and sum on Market Value and % of Net Assets. Then add a formula tool which will be [Composite] + " Total" to add the word total after the Composite number. Union that data back into your main workflow. Then add a Sort tool on the Composite field. This will insert the summarize rows after each group of composite numbers.
