i posted a question earlier i can't see it now, so here it is again.

I've been working with a database of dates and quantities i need to inset a
total quantity in a monthly basis example:
5/15/2006 2,400
5/19/2006 10,400
5/30/2006 18,000
6/2/2006 3,200
6/2/2006 22,000
6/12/2006 22,000
6/16/2006 12,800
6/16/2006 22,000
6/30/2006 5,600


I need to separate may from june and add athe quantities but the subtotal
function does it by each date. anybody can help me here???
Is taking me all morning.

thanks