I know this may not be a great answer but I have done this before in C# to automate a PowerPoint and copy Excel charts over to it.
chart.ChartArea.Copy();
Powerpoint.Slide slide = ppPres.Slides[slideNum];
Powerpoint.ShapeRange shapeRange = slide.Shapes.Paste();
Essentially, you want to paste your Chart object to the Shapes object of the active slide.
This is an example I found online which may help you with syntax and other commands:
Sub ChartToPresentation()
' Uses Early Binding to the PowerPoint Object Model
' Set a VBE reference to Microsoft PowerPoint Object Library
Dim PPApp As PowerPoint.Application
Dim PPPres As PowerPoint.Presentation
Dim PPSlide As PowerPoint.Slide
' Make sure a chart is selected
If ActiveChart Is Nothing Then
MsgBox "Please select a chart and try again.", vbExclamation, _
"No Chart Selected"
Else
' Reference existing instance of PowerPoint
Set PPApp = GetObject(, "Powerpoint.Application")
' Reference active presentation
Set PPPres = PPApp.ActivePresentation
PPApp.ActiveWindow.ViewType = ppViewSlide
' Reference active slide
Set PPSlide = PPPres.Slides _
(PPApp.ActiveWindow.Selection.SlideRange.SlideIndex)
' Copy chart as a picture
ActiveChart.CopyPicture Appearance:=xlScreen, Size:=xlScreen, _
Format:=xlPicture
' Paste chart
PPSlide.Shapes.Paste.Select
' Align pasted chart
PPApp.ActiveWindow.Selection.ShapeRange.Align msoAlignCenters, True
PPApp.ActiveWindow.Selection.ShapeRange.Align msoAlignMiddles, True
' Clean up
Set PPSlide = Nothing
Set PPPres = Nothing
Set PPApp = Nothing
End If
End Sub
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