Merge duplicate rows and combine data in some of the same columns

Have spreadsheet with multiple columns and rows. Where the data in column C matches another in column C, want the information in columns in E:I to be added together. Information in columns A, B, K and L will be the same and should be retained.

Therefore in the example spreadsheet attached, cells E8 - I9 would be added together, likewise E18 - I19 and row 9 and 19 would disappear.

Help appreciated to run a macro to achieve.

KenBook4.xlsx

try

Option Explicit

Sub test()
    Dim dic As Object, i As Long
    Set dic = CreateObject("Scripting.Dictionary")
    With Range("a5").CurrentRegion
        For i = 1 To .Rows.Count
            If Not dic.exists(.Cells(i, 3).Value) Then
                Set dic(.Cells(i, 3).Value) = .Rows(i).Range("e1:i1")
            Else
                dic(.Cells(i, 3).Value).Value = _
                .Parent.Evaluate(dic(.Cells(i, 3).Value).Address & "+" _
                & .Rows(i).Range("e1:i1").Address)
                .Rows(i).EntireRow.Delete
                i = i - 1
            End If
        Next
    End With
End Sub

Excellent - works great - thanks jindon