[X4U] Spreadsheets that can split window > 1 time

[Michael Elliott]

Sorry for the cryptic subject, but hard to describe what I'm looking  
for.

I'm still using Appleworks as my primary spreadsheet application.

I have tried to make a transition to another spreadsheet app, but  
found that one feature in Appleworks keeps me hooked on it:  the  
ability to split the spreadsheet window into more than two vertical or  
horizontal panes.

Excel and MarinerCalc allow splitting of the window once vertically  
and once horizontally, into 4 separately-scrollable panes.  But I need  
to split the window into 3 both verticaly and horizontally.  (I have  
some complex spreadsheets in which I need the top, bottom, and side  
columns and rows of the sheets to stay put, while I move around the  
center.)  AppleWorks allows this, but I can't find the functionality  
anywhere else.  I've Googled, but can't seem to find anything.

Perhaps this functionality exists in Excel and other spreadsheet apps,  
through some other means? Any suggestions?

Michael