月份累計 指定項目的總和 (14481)

V3:X11=SUMPRODUCT((LEFTB($B$2:$S$2,2)-LEFTB(V$2,2)<=0)*($B$1:$S$1=V$1)*(0&$B3:$S3))

另解{=SUM(SUMIFS($B3:$S3,$B$2:$S$2,ROW(INDIRECT("1:"&LEFTB(V$2,2)))&"月",$B$1:$S$1,V$1))