Excel VBA macro for one column, if true, apply formula to another column - vba

Question

For context:
I would like for the program to look through column B, identify the first "< / >" (which is purely stylistic and can be changed if necessary - it's only used to break up the data) as the start of a week at cell B9 and the next "< / >" (end of the week) at B16. So the range I'm interested in is B10-B15. It would then sum those numbers from J10 to J15 (Earned column) and paste that sum in L16 (Week Total column). The same could then be done with 'Hours' and 'Week Hours'. For the following week (and thereafter) the 'end of the week' "< / >" becomes the start of the week, and the program continues until B200.
I don't have any experience with VBA and so made the following incomplete attempt (based on what I had found online) but felt too out of my depth not to ask for help.
Sub Work()
Dim rng As Range
Dim rngFound As Range
Set rng = Range("B:B")
Set rngFound = rng.Find("</>")
If rngFound Is "</>" Then
If Cell = "</>" Then
End If
End Sub
Thank you for any help and please let me know if I can be clearer or elaborate on something.

Answer 1

The following code will loop through 200 lines, looking for your symbol. When found, it will sum the numbers in column J for rows between the current row and the last symbol.
I've included two lines that will update the formula. To me, the 2nd one is easier to understand.
Sub Work()
Dim row As Integer
row = 4
Dim topRowToAdd As Integer 'Remember which row is the
'top of the next sum
topRowToAdd = 4
While row <= 200
If Cells(row, 2) = "</>" Then
'Cells(row, 10).FormulaR1C1 = "=SUM(R[" & -(row - topRowToAdd) & "]C[0]:R[" & -1 & "]C[0])"
Cells(row, 10).Value = "=SUM(J" & topRowToAdd & ":J" & row - 1 & ")"
topRowToAdd = row + 1
End If
row = row + 1
Wend
End Sub

Answer 2

Sub Work()
Dim rng As Range, rngFound As Range
Set rng = Range("B:B")
Set rngFound = rng.Find("</>")
If rngFound.Value2 = "</>" Then
'whatever you want to do
End If
End Sub
So at a second glance it looks like this. If you'd like to make it structured you'd need to use a countifs function first.
Sub Work()
Dim rng As Range, rngFound(1) As Range
Set rng = Range("B1:B200")
On Error GoTo Err 'it is quite possible it will run into an error if there are no matches and I'm too lazy for structured solution
Set rngFound(0) = rng.Find(What:="</>", LookAt:=xlWhole, SearchDirection:=xlNext) 'finds the first
Set rngFound(1) = rng.Find(What:="</>", LookAt:=xlWhole, SearchDirection:=xlNext, After:=rngFound(0)) 'finds the first after the first (i.e. the second)
Set rngFound(0) = rngFound(0).Offset(1, 8) '8 is the difference between B and J, row shifts as per description, I advise you to make it a variable
Set rngFound(1) = rngFound(1).Offset(-1, 8)
If rngFound(1).Row > rngFound(0).Row Then 'if it's not higher, then it recurred and found the first range again
rngFound(1).Offset(1, 2).Formula = "=SUM(" & Range(rngFound(0), rngFound(1)).Address & ")" 'L column will have the sum as a formula
Else
MsgBox "There is a single match in " & rng.Address(False, False)
End If
If False Then
Err:
MsgBox "There are no matches in " & rng.Address(False, False)
End If
End Sub
Now for the grand finale:
Sub Work()
Dim rng As Range, rngFound() As Range, rngdiff(1) As Long, rngcount As Long
Set rng = Range("B1:B200")
rngcount = rng.Cells.Count
ReDim rngFound(rngcount)
rngdiff(0) = Range("J1").Column - rng.Column ' the range that needs to be summed is in column J
rngdiff(1) = Range("L1").Column - rng.Column ' the range containing the formula is in column L
On Error GoTo Err 'it is quite possible it will run into an error if there are no matches and I'm too lazy for structured solution
Set rngFound(0) = rng.Find(What:="</>", LookAt:=xlWhole, SearchDirection:=xlNext) 'finds the first
'loop starts
For i = 1 To rngcount
Set rngFound(i) = rng.Find(What:="</>", LookAt:=xlWhole, SearchDirection:=xlNext, After:=rngFound(i - 1)) 'finds the next
If rngFound(i).Row > rngFound(i - 1).Row Then 'if it's not higher, then it recurred and found the first range again
rngFound(i).Offset(0, rngdiff(1)).Formula = "=SUM(" & Range(rngFound(i - 1).Offset(1, rngdiff(0)), rngFound(i).Offset(-1, rngdiff(0))).Address & ")" 'L column will have the sum as a formula
Else
Exit Sub 'if it recurred the deed is done
End If
Next i
If False Then
Err:
MsgBox "There are no matches in " & rng.Address(False, False)
End If
End Sub