excel - macro to add value in cells corresponding to same category -


i new macro-vba . helpful if 1 guide me in following.

i have data-set has category name in column , in column b corresponding values. it looks this

based on category name in column a, should sum of values present in b. if cells a1:a3 belongs category "a", values present in b1:b3 should summed , corresponding rows should merged in column c , resultant sum should displayed in column c output should this

i tried code using in following way

sub main() dim long dim long '  dim sum long sum = 0 dim samerows boolean samerows = true = 1 range("a" & rows.count).end(xlup).row      if strcomp(cells(i, 1), cells(i + 1, 1), vbtextcompare)         samerows = false     end if      if samerows         sum = sum + cells(i, 1).value         range(cells(i, 2), cells(i + 1, 2)).merge     end if      samerows = true     cells(i, 2).value = sum next  end sub

but code wrong unable provide proper cell reference values.

it of great help, if 1 share thoughts , guide me code

trying keep close style code possible, added count of number of cells needed ensure reference top left cell in field of merged cells (as excel stores values), added few more summary instances. please try following:

sub main() dim long dim long '  dim sum long dim mergecnt long mergecnt = 0 sum = 0 dim samerows boolean samerows = true = 1 range("a" & rows.count).end(xlup).row      if strcomp(cells(i, 1), cells(i + 1, 1), vbtextcompare)         sum = sum + cells(i, 2).value         samerows = false     end if     debug.print (sum)     if samerows         sum = sum + cells(i, 2).value         range(cells(i, 3), cells(i + 1, 3)).merge         mergecnt = mergecnt + 1     else:         cells(i - mergecnt, 3).value = sum         sum = 0         mergecnt = 0     end if      samerows = true     cells(i, 3).value = sum next  end sub

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