I couldn’t find any examples of text formatting in excel.
Perhaps I was using the wrong keywords?
Anyway I wanted to post some examples for anyone who might need them:
tell application "Microsoft Excel"
tell worksheet "Sheet1" of active workbook
set font size of font object of range "A1:H1" of worksheet "sheet1" to 11
set bold of font object of range "A1:H1" of worksheet "sheet1" to true
set underline of font object of range "A1:H1" of worksheet "sheet1" to underline style single
end tell
end tell
Good luck!