First, change sheet name to Jan, Feb,...(3 letters format)
Sheet summary row 4 is months Jan, Feb,...(3 letters format)
All 12 sheets of month have same margin (Week1 to 4 tables are put in same row, column index).
C6:
=IFERROR(SUMPRODUCT((INDIRECT(B$4&"!$c$23:$c$27")=$B6)*(TEXT(INDIRECT(B$4&"!$D$23:$J$27"),"mmm")=C$4)*(INDIRECT(B$4&"!$D$23:$J$27")="HOL")),0)
+SUMPRODUCT((INDIRECT(C$4&"!$c$7:$c$11")=$B6)*(TEXT(INDIRECT(C$4&"!$D$4:$J$4"),"mmm")=C$4)*(INDIRECT(C$4&"!$D$7:$J$11")="HOL"))
+SUMPRODUCT((INDIRECT(C$4&"!$C$13:$C$27")=$B6)*(INDIRECT(C$4&"!$D$13:$J$27")="HOL"))
+SUMPRODUCT((INDIRECT(C$4&"!$c$23:$c$27")=$B6)*(TEXT(INDIRECT(C$4&"!$D$23:$J$27"),"mmm")=C$4)*(INDIRECT(C$4&"!$D$23:$J$27")="HOL"))
+IFERROR(SUMPRODUCT((INDIRECT(D$4&"!$c$7:$c$11")=$B6)*(TEXT(INDIRECT(D$4&"!$D$4:$J$4"),"mmm")=C$4)*(INDIRECT(D$4&"!$D$7:$J$11")="HOL")),0)
For specific month, i.e, Feb, there are 5 SUMPRODUCTs which:
1st, count feb days in week 4 of previous month Jan
2nd, count feb days in week 1 of feb
3rd, count feb days in week 2+3 of feb
4th, count feb days in week 4 of feb
5th, count feb days in week 1 of next month Mar.
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