Hi:
I'm not sure what you mean by "page break" since there are several different ways to interpret that. However, if you wanted to start a new worksheet every time VALUEB changed, then you should investigate the SHEET_INTERVAL suboption with TAGSETS.EXCELXP.
If you want -printing- control over the data in one worksheet, then I believe that you may have to use Excel techniques to insert page breaks into a worksheet (such as applying an Excel macro to a sheet). Since in the Excel world, you have to be in a special PAGE VIEW in order to get the menu to insert page breaks.
However, for the definitive response on how to insert page breaks (or whether it's possible) using TAGSETS.EXCELXP, you should consider opening a track with Tech Support.
This paper on using TAGSETS.EXCELXP is very useful in explaining all the print options available to you:
http://www.nesug.org/proceedings/nesug08/ap/ap06.pdf
cynthia