Hi Blanche,
Welcome to this Microsoft Project newsgroup
If you mean zero all %Complete, then click All button (the cell above the
ID heading) so the whole project is selected. Now Project/Task
Information.../General tab and enter zero in the Percent Complete box/OK.
FAQs, companion products and other useful Project information can be seen
at this web address: <
http://www.mvps.org/project/>
Hope this helps - please let us know how you get on
Mike Glen
MS Project MVP