There are a couple ways to do this. One is to use NI's Excel toolkit, if you have it. If not, it's a $$ add-on you can get.
To do it yourself, you need to use ActiveX to communicate with Excel. Place an Excel.Application activeX control on your front panel. Now, in your diagram, feed that control into methods and properties nodes to get a workbooks object, a workbook object, a sheets object and then a range object. You can then write the table directly into Excel. The attached example may or may not work depending on your version of Excel (mine is XP).
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