VBA Code for adding sheet from range specified in another sheet

Function CountRows(WhatSheet)
Dim cellcount
cellcount = 0
ThisWorkbook.Worksheets(WhatSheet).Select
cellcount = Cells(ThisWorkbook.Worksheets(WhatSheet).Rows.Count, 1).End(xlUp).Row
CountRows = cellcount

End Function

Sub PasteToSheet(WhatSheet)
    Dim tmpRow
    tmpRow = CountRows(WhatSheet)
    
    ThisWorkbook.Worksheets(WhatSheet).Select
    Cells(tmpRow, 1).EntireRow.Select
    Selection.Insert
    Application.CutCopyMode = False
End Sub

Function SheetToSheet(FromWhatSheet, FromWhatRow, ToWhatSheet)
Dim tmpCellValue
tmpCellValue = ""

        ThisWorkbook.Worksheets(FromWhatSheet).Select
        ActiveSheet.Range("A" & FromWhatRow).EntireRow.Select
        Selection.Copy
        PasteToSheet (ToWhatSheet)
        
End Function

Function CheckIfIsSheet(SheetName) As Boolean
      CheckIfIsSheet = False
      For Each ws In Worksheets
        If SheetName = ws.Name Then
          CheckIfIsSheet = True
          Exit Function
        End If
      Next ws
End Function


Private Sub CreateTheSheet(NamedWhat)
    Dim Works As Worksheet
    With ThisWorkbook
        Set Works = .Sheets.Add(After:=.Sheets(.Sheets.Count))
        Works.Name = NamedWhat
    End With
End Sub


Sub CreateBook(WhatSheet)
Dim Mainsheet
Dim RowCount
Dim CurrentRow
Dim StartingRow
Dim WhatRow
Dim CellValue
Dim CellToCheck
Dim sheetTAB As Worksheet
StartingRow = 2 'Change this value to whatever row your master sheet starts on
Mainsheet = WhatSheet
ThisWorkbook.Worksheets(Mainsheet).Select
RowCount = CountRows(Mainsheet)
' MsgBox (RowCount) 'unREM for Feedback
    'Now need to check if there is any info on the master sheet
    If CurrentRow > RowCount Then
        MsgBox ("No Entries on Worksheet " & Mainsheet & ".  Now closing!")
        'Upon finding no info, it closes
        Exit Sub
    End If
    'Now we need ot loop through each line and see if we have a worksheet
                For CurrentRow = StartingRow To RowCount
                    CellToCheck = "B" & CurrentRow
                    CellValue = ThisWorkbook.Worksheets(Mainsheet).Range(CellToCheck).Value
                    MsgBox (CellValue) 'unREM for feedback
                                                'need to see if the tab exist, if not create it
                                                doesSheetExist = CheckIfIsSheet(CellValue)
                                                MsgBox (doesSheetExist)
                                                    If doesSheetExist = False Then
                                                            CreateTheSheet (CellValue)
                                                    End If
                                                nret = SheetToSheet(Mainsheet, CurrentRow, CellValue)
                                                ThisWorkbook.Worksheets(Mainsheet).Select
                Next
End Sub