thanks
I finally figure it out
For Jan I use
=SUMIF(CBN!$A:$A,">=" & DATE(2004,1,1),CBN!$F:$F)-SUMIF(CBN!$A:$A,">=" &
DATE(2004,1,31),CBN!$F:$F)
For Feb I use
=SUMIF(CBN!$A:$A,">=" & DATE(2004,2,1),CBN!$F:$F)-SUMIF(CBN!$A:$A,">=" &
DATE(2004,2,31),CBN!$F:$F)