Sum by YTD(year to Date) as financial year from 1st April to 31st march

Please try

=SUMIFS(abc!$C:$C,abc!$A:$A,">=" &DATE(YEAR($C$1),4,1),abc!$A:$A,"<=" & $C$1)

=SUMIFS(abc!$B:$B,abc!$A:$A,">=" &DATE(YEAR($C$1),4,1),abc!$A:$A,"<=" & $C$1)

OR

=SUMIFS(abc!$B:$B,abc!$A:$A,">="&DATE(YEAR($C$1),4,1),abc!$A:$A,"<="&DATE(YEAR($C$1)+1,3,31))