Creating a procedure that takes in a variable then returns another to the calling procedure in Excel VBA

Question

I want to create functionality that will allow me to pass a variable to a procedure, have it open a file based on that variable, and then return the filepath into calling procedure. I have the code for opening the file etc, but as there are multiple places in the procedure where it could be called, I don't want it to be there, but just to return the filepath into a variable (which can then be used to load fields from the opened file).

The code to load the file that I am using is below, how would I convert this to a procedure to do what I need?:

        'Open the file
        NameOfFile = ActiveWorkbook.Worksheets("Parameters").Cells(8, 2).Value
        PathToFile = Left$(NameOfFile, InStrRev(NameOfFile, "\") - 1)
        FileNameNoPath = Mid$(NameOfFile, InStrRev(NameOfFile, "\") + 1)
        NameOfFile = FileNameNoPath
        CompleteFilePath = PathToFile & "\" & NameOfFile

        On Error Resume Next
        Set File1 = Workbooks(NameOfFile)

        If Err.Number <> 0 Then
        'Open the workbook
          Err.Clear
          Set File1 = Workbooks.Open(CompleteFilePath, UpdateLinks:=False)
          CloseIt = True
        End If

        'Check and make sure workbook was opened
        If Err.Number = 1004 Then
            MsgBox "File is missing, please check your path!" _
            & vbNewLine & NameOfFile
            Exit Sub
        End If
        On Error GoTo 0

Answer 1

You mean like this?

Option Explicit

Dim FilePath As String

Sub Sample()
    Dim FileToOpen As String

    FileToOpen = "C:\Temp\Sample.xlsx"

    OpenFile FileToOpen

    Debug.Print FilePath
End Sub

Sub OpenFile(strFile As String)
    FilePath = Left$(strFile, InStrRev(strFile, "\") - 1)

    '
    '~~> Rest of the code
    '
End Sub