OK, I've had a small mental breakthrough on this. I spent about 5 hours working on an income statement because there were no columns for % of Sales (and this was multiple spreadsheets - used a tree). While I'm sure it would have gone faster if I knew more about Excel, I at least got the IDEA - that sometimes you just have to START with the Designer, and then modify the hell out of it in Excel. So, while I was having heart palpitations about the side by side Balance Sheet these folks want, with a column that is combined - I realized as long as I can get it to finally generate the side by side part, I can create the column that is combined and simply add the other 2 columns together.
The only down side I see of this (which so far is making me feel a bit more generously towards SMI, although it was nice in FRx that FRx did all the work and you didn't have to manually change anything) - once you have modified the format, it seems to stop giving you some of the options when it runs, like the prompt for the tree (but I may have just missed it). Also, you will not be able to use the Designer for changes if the client adds new accounts, etc, correct? Once you have modified the format, ALL further changes have to be manually done in Excel and you can never do it via the Designer ever again?