VBA IF Then Else Looping issues, Confused on comparing values and logic - excel

Question

I have gone crazy with vba projects around the house and helping my wife upping her reports to the next level. I’m having troubles putting down to VBA what I’m thinking. If anyone has felt my pain please shed some light on the actual script that would help me over this hump. Summary might be comparing cell value for certain text using InStr and if doesn't exist the appending characters to the right end. I can append and run thru one cycle of the loop but get confused with trying to write the logic I'm thinking.
Alittle background on the report: One row equals one reservation. Within that row there is a column labeled “Nights”. This column is filtered for any reservation with more than “1” Night. Example: could be 3 nights, 6 nights, and 10 nights doesn’t matter. I have a macro that sorts these reservations and splits the one reservation into multiple rows totaling the number value in the “Nights” column. Basically, copying and inserting the rows next to each other. While this filtered is still applied (SpecialVisibleCells Only). Now I have another column labeled “ResNumber”. With 3, 6, or 10 rows split out the “ResNumber” column is the same number. I’m tasked with walking down this ‘ResNumber” column and appending a “-1” for the first row. A “-2” for the second reservation “-3” for the third and possibly a forth “-4” Until the last row of the copied for that one reservation group. Then the cycle (loop) starts again on the next group or block of rows. Same procedure.
Dim lnrow As Integer
Dim llrow As String
Dim rownuml As Integer 'row checker
Dim colnuml As String 'column checker
Dim count As Integer
Dim total As String 'Value of reservation's "Nights" column Offset(,17)
Dim startnum As Integer 'Start number for counter
Dim actcell As String 'Activecell
startnum = 1
With sh
llrow = .Cells(.Rows.count, 2).End(xlUp).row
If llrow = "" Then Exit Sub
.Cells(2, 2).Resize(llrow - 1).SpecialCells(xlCellTypeVisible).Select
For lnrow = 2 To llrow
rownuml = ActiveCell.row
colnuml = ActiveCell.Column
total = ActiveCell.offset(, 17).Value
For count = 1 To total
rownuml = ActiveCell.row
colnuml = ActiveCell.Column
actcell = ActiveCell.Value
'Compares row 1 and checks resNumber value for "-1" if none exist it appends.
If InStr(ActiveCell.Value, "-1") = 0 Then
ActiveCell.Value = ActiveCell.Value & "-1"
Else
GoTo nexrow
End If
'Compares row 2 and checks resNumber value of above cell.
If InStr(ActiveCell.offset(-1, 0).Value, "-1") = 0 Then
Resume Next
If InStr(ActiveCell.Value, "-2") = 0 Then
ActiveCell.Value = ActiveCell.Value & "-2"
GoTo nexrow
End If
'to jump out of loop nexrow
'ActiveCell moves one row down.
ActiveCell.offset(1, 0).SpecialCells(xlCellTypeVisible).Select
rownuml = ActiveCell.row 'just checking row number
colnuml = ActiveCell.Column 'just checking column number
'since 1st reservation is already in the DB startnum starts at # 1. The counter
startnum = startnum + count
Next count
Next
End With

Answer 1

Try:
Option Explicit
Sub test()
Dim LastRow As Long, Times As Long, Counter As Long, i As Long, y As Long
Dim strNumber As String
With ThisWorkbook.Worksheets("Sheet1")
LastRow = .Cells(.Rows.Count, "B").End(xlUp).Row
For i = 2 To LastRow
strNumber = .Range("B" & i).Value
Times = Application.WorksheetFunction.CountIf(.Range("B2:B" & LastRow), strNumber)
If Times > 1 Then
Counter = 1
For y = 2 To LastRow
If strNumber = .Range("B" & y).Value Then
.Range("B" & y).Value = strNumber & " - " & Counter
.Range("D" & y).Value = 1
Counter = Counter + 1
End If
Next y
End If
Next i
End With
End Sub
Results: