Powerpoint: how to insert document property (aka 'field') in slide?

While Word can do this, PowerPoint can't. AFAIK, you can have document properties in PPT, but you cannot insert them on a slide. The only updating field available for PowerPoint is the date and slide number. Anyway, there could be some workaround in VBA to achieve this. You can ask this on Stackoverflow to take your chance.

Just wrote a subroutine to put named properties into tagged text objects on all slides.

To put a file property onto slide(s). Create a textbox to hold the string. In the properties/Alt Text put the property name into square brackets.

Then execute the macro updateProperties().

i.e. [title] - would allow the document title to be updated on multiple

Two special tags have been written:

[copyright] would insert a copyright string, i.e. © 1998-2013 P.Boothroyd, NIS Oskemen

[page] would insert the slide number from the editor tab

' Copy document properties into all slides
' (c) 2013, P.Boothroyd for NIS Oskemen
Dim processPage As Slide

Sub updateProperties()
    Dim page As Slide
    Dim propname As String
    ' parse all slides in the active presentation (document)
    For Each processPage In Application.ActivePresentation.Slides
        ' scan all elements of page for textbox with tagged "altText/title" field with "["
        For Each obj In processPage.Shapes
            If Left(obj.Title, 1) = "[" Then
                Dim sStart, sEnd As Integer
                ' extract property from between square brackets
                sStart = 2
                sEnd = InStr(2, obj.Title, "]")
                propname = Trim(Mid(obj.Title, sStart, sEnd - 2))
                If obj.Type = msoTextBox Then
                    ' set the text box to the requested value
                    obj.TextFrame.TextRange.Text = getProperty(propname, obj.TextFrame.TextRange.Text)
                End If
            End If
        Next ' obj
    Next ' page
End Sub

' get the named document property (with optional default)
Function getProperty(propname, Optional def As String) As String
    ' property assigned the default value
    getProperty = def
    Dim found As Boolean
    found = False
    propname = LCase(propname)

    ' copyright is a generated property
    If propname = "copyright" Then
        Dim author As String
        Dim company As String
        Dim yearFrom As String
        Dim yearTo As String

        ' get all appropriate variables
        author = getProperty("author", "")
        company = getProperty("company", "")
        yearFrom = getProperty("created", "")
        yearTo = Format(Now(), "YYYY")

        ' insert copyright symbol
        getProperty = Chr(169) + " "

        ' attach year span for copyright notice
        If yearFrom  yearTo Then
            getProperty = getProperty + yearFrom + "-"
        End If
        getProperty = getProperty + yearTo

        ' add the author
        getProperty = getProperty + " " + author

        ' add separator for author/company if both exist
        If Len(author) > 0 And Len(company) > 0 Then
            getProperty = getProperty & ", "
        End If
        getProperty = getProperty & company

        ' processed, so return the value
        found = True
    End If

    ' insert the slide number into the document
    If propname = "page" Then
        getProperty = processPage.SlideNumber
        found = True
    End If

    ' if generated name created return the value
    If found Then GoTo ret

    ' scan for standard MS (file) properties of the named value
    For Each p In Application.ActivePresentation.BuiltInDocumentProperties
        If LCase(p.Name) = propname Then
            getProperty = p.Value
            found = True
            Exit For
        End If
    Next ' p

    ' scan for customised properties of the named value
    If found Then GoTo ret
    For Each p In Application.ActivePresentation.CustomDocumentProperties
        If LCase(p.Name) = propname Then
            getProperty = p.Value
            found = True
            Exit For
        End If
    Next ' p
ret:
End Function