Hi Bryan,
What you are describing can be accomplished by using simple "Macro"s in Excel. Therefore you can simply start a small Macro that for example changes the Y axis title from horizontal to vertical alignment. After recording this Macro, you can run it from LabVIEW whenever you want. Please refer to the Shipping Example called "Run Macro on Word Table.vi" for a way to call the Macro (in this case Word, but it's similar for Excel).
Have fun!
- Philip Courtois, Thinkbot Solutions