How to automate to insert the document title in each slide of the powerpoint presentation using VBA

I had this question after viewing Replacing text in PowerPoint 2016 using VBA.

Is it possible that I can insert a custom textbox in slide theme and it gets updated in actual slides ?
Here what I am trying to do in power point VBA which I have done successfully in Visio VBA.

I want to put the presentation file name on all slides of a presentation.  I have 50+ such presentations containing 25+ slides in each presentation.  The above code requires that I insert a text box on each of the slide manually and then it works if I run the macro.  Any suggestion how to automate the process using Powerpoint VBA ?

I do not want to change the slides theme for each presentation by inserting a text box with file name.  That would defeat the purpose of automation. Visio VBA does it very easily by using code in Auotexec module for each slidepack.
Suresh AgrawalPresidentAsked:
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Jamie GarrochSenior Technical Consultant at BrightCarbonCommented:
You could simplify the process as follows:

1. Open the slide master "parent" by holding the Shift key and double-clicking the Normal view icon in the bottom right hand half of the status bar in PowerPoint.
2. Insert a text box into the parent slide of the master.
3. With the text box selected, insert the following macro (Alt+F11) and run it (Alt+F8)

' PowerPoint VBA Macro
' Author : Jamie Garroch of BrightCarbon (https://brightcarbon.com/)
' Date : 16JAN2019
' Purpose : insert the current presentation's file name into the selected shape
Sub InsertFileNameIntoSelectedShape()
  
  On Error GoTo errorhandler
  
  With ActiveWindow.Selection
    If .Type = ppSelectionShapes Or .Type = ppSelectionText Then
      With ActiveWindow.Selection.ShapeRange(1)
        If .HasTextFrame Then
          .TextFrame.TextRange.Text = ActivePresentation.Name ' or .FullName if path required
        Else
          GoTo quit
        End If
      End With
    Else
      GoTo quit
    End If
  End With
  
Exit Sub

quit:
  MsgBox "Select a shape that supprts text.", vbCritical + vbOKOnly, "Invalid Selection"
Exit Sub

errorhandler:
  MsgBox "Error :" & Err & vbCrLf & vbCrLf & Err.Description, vbCritical + vbOKOnly, "Unhandled Error"

End Sub

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Suresh AgrawalPresidentAuthor Commented:
Hi Jamie,

Your code works. I was just wondering if the textbox (shape) in the parent slide of the master can be given a fixed name and referred to that name in the code. So that we don't have to open the master for new presentation and run this manually. Anytime a new presentation is opened, the master will update the presentation name automatically in the text box.  This code then can possibly  be run in autoexec module in ppt VBA ?

Regards

Suresh Agrawal
Suresh AgrawalPresidentAuthor Commented:

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