In the example below I need to sum the counts of 2 or more groups based upon
a match of start times in column B and return that sum to column F. Below
the example, I have a formula that compares the start times in Column B to
Column E and returns a single value. My problem is I don't know how to sum
all the counts of Column C if the start times match. If you can help I would
appreciate it! Many thanks!


Data

Column A Column B Column C
Group Time Count
7750 6:00am 21
7750 6:15am 35
7750 6:30am 12
7750 7:00am 0
7757 6:00am 15
7757 6:30am 20
7757 7:00am 9
7758 6:15am 10

Desired Result:

Column E Column F
Time Count
6:00am 36 (sum of group 7750 & 7757 since they both have 6:00am start
times
6:15am 45 (sum of groups 7750, 7757, & 7758)
6:30am 32
6:45am (blank due to no time match)
7:00am 9

=IF(ISERROR(MATCH(A2,$K$3:$K$27,0)),"",INDEX($L$3: $L$27,MATCH(A2,$K$3:$K$27,0)))