This scriptlet will add the sheet to your existing workbook. The file "c:\test.xls" needs to exist - no checking.

code:
$objXL = CreateObject("Excel.Application")
$objWorkBook = $objXL.WorkBooks.Open("c:\test.xls")
$objNewSheet = $objWorkBook.Worksheets.Add
$objNewSheet.Name = "New Sheet"
$objXL.Visible = 1
$objXL = 0
Exit
Also you could try looking at the code excerpt I offered in this thread to see how you can reference different cells in Excel - looping through cells, moving between cells, etc.

Hope this helps.

-Breaker
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Breaker