Hi:
Run your job with the sub-option for doc:
[pre]
ods tagsets.excelxp file='xxxx.xml' options(doc='Help');
[/pre]
and then look for the SHEET_INTERVAL sub-option. I believe that you can control whether a new tab starts by using that sub-option.
In addition, if you want more control over printing of the ExcelXP spreadsheet from within Excel, this is a very useful paper:
http://www.nesug.org/proceedings/nesug08/ap/ap06.pdf
cynthia