assign variable name to the workbook

[yjmmay34]

Hi, all. please help woth this problem.
I want to open two file at the beginning of the code, like below, and after the two files are opened, i want to activate one of the file first, and i must write the exactly same name as the workbook name, then i can activate the window. Is there any way so that assign a variable to the workbook name, and any time, i call the variable, it will know which window should be activated.

Private Sub FileFormat()
    Workbooks.Open (Application.GetOpenFilename(, , "Please locate your file"))
    Workbooks.Open (Application.GetOpenFilename(, , "Please locate your file"))
    Windows("Pricelist").Activate
        j = 1
    Do While j <= 5
        Windows("Pricelist").Activate
        If j = 1 Then
            SheetName = "400nm & Above"
        ElseIf j = 2 Then
            SheetName = "350nm,320nm,300nm"
        ElseIf j = 3 Then
            SheetName = "250nm,220nm,200nm"
        ElseIf j = 4 Then
            SheetName = "180nm,160nm,150nm,140nm"
        ElseIf j = 5 Then
            SheetName = "130,110(200mm)"

        End If
        
        Sheets(j).Select
        TotalRowCount = ActiveSheet.UsedRange.Rows.Count
        i = 1
        FinalMasterRow = 0
        Do While ActiveSheet.Cells(i, 1).Value <> "End"
            Rows(i).Select
            i = i + 1
        Loop
        FinalMasterRow = i + 2
        RowCount = TotalRowCount - FinalMasterRow
        Range(Cells(FinalMasterRow, 1), Cells(TotalRowCount, "DO")).Select
        Selection.Copy
        Windows("CombinedPriceList").Activate
        Sheets("200mm").Select
        a = ActiveSheet.UsedRange.Rows.Count
        Cells(a + 1, 1).Select
        Selection.PasteSpecial Paste:=xlPasteValues, Operation:=xlNone, SkipBlanks _
        :=True, Transpose:=False
        Selection.NumberFormat = "0"
        j = j + 1
      
    Loop

in this example, the two file name are "PriceList" and "CombinedPriceList". If i change the file name to "PriceList01" and "CombinedPriceList01", then the macro will get error. so i want to overcome this problem.
Any help will be appreciated!