If you are exporting to an existing excel file, then it automatically starts in the first empty row.
If you are creating one from scratch, I'm not sure how you can do this in a data pump task though.
There is a lot you can do in vbScript. It's a little more work but you can create custom spreadsheets that way.
Hope this helps,
Alex
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I don't do any programming whatsoever
Ignorance of certain subjects is a great part of wisdom