I'd keep the data in one worksheet.

Then use data|filter|autofilter to see the info that I want.

But if you really, really must.  Keep the data in one worksheet and refresh the
worksheets whenever you need (not while doing input--just run the macro when
you're ready).

Ron de Bruin's EasyFilter addin:
http://www.rondebruin.nl/easyfilter.htm

Code from Debra Dalgleish's site:
http://www.contextures.com/excelfiles.html

Create New Sheets from Filtered List -- uses an Advanced Filter to create
separate sheet of orders for each sales rep visible in a filtered list; macro
automates the filter. AdvFilterRepFiltered.xls 35 kb

Update Sheets from Master -- uses an Advanced Filter to send data from
Master sheet to individual worksheets -- replaces old data with current.
AdvFilterCity.xls 55 kb

If you're new to macros, you may want to read David McRitchie's intro at:
http://www.mvps.org/dmcritchie/excel/getstarted.htm