Here's some code from http://mahipalreddy.com/vba.htm
''# Code by Mahipal Padigela
''# Open Microsoft Powerpoint,Choose/Insert a Table type Slide(No.4), then double click to add a...
''# ...Table(3 Cols & 2 Rows) then rename the Table to "Table1", Save and Close the Presentation
''# Open Microsoft Excel, add some test data to Sheet1(This example assumes that you have some data in...
''# ... Rows 1,2 and Columns 1,2,3)
''# Open VBA editor(Alt+F11),Insert a Module and Paste the following code in to the code window
''# Reference 'Microsoft Powerpoint Object Library' (VBA IDE-->tools-->references)
''# Change "strPresPath" with full path of the Powerpoint Presentation created earlier.
''# Change "strNewPresPath" to where you want to save the new Presnetation to be created later
''# Close VB Editor and run this Macro from Excel window(Alt+F8)
Dim oPPTApp As PowerPoint.Application
Dim oPPTShape As PowerPoint.Shape
Dim oPPTFile As PowerPoint.Presentation
Dim SlideNum As Integer
Sub PPTableMacro()
Dim strPresPath As String, strExcelFilePath As String, strNewPresPath As String
strPresPath = "H:\PowerPoint\Presentation1.ppt"
strNewPresPath = "H:\PowerPoint\new1.ppt"
Set oPPTApp = CreateObject("PowerPoint.Application")
oPPTApp.Visible = msoTrue
Set oPPTFile = oPPTApp.Presentations.Open(strPresPath)
SlideNum = 1
oPPTFile.Slides(SlideNum).Select
Set oPPTShape = oPPTFile.Slides(SlideNum).Shapes("Table1")
Sheets("Sheet1").Activate
oPPTShape.Table.Cell(1, 1).Shape.TextFrame.TextRange.Text = Cells(1, 1).Text
oPPTShape.Table.Cell(1, 2).Shape.TextFrame.TextRange.Text = Cells(1, 2).Text
oPPTShape.Table.Cell(1, 3).Shape.TextFrame.TextRange.Text = Cells(1, 3).Text
oPPTShape.Table.Cell(2, 1).Shape.TextFrame.TextRange.Text = Cells(2, 1).Text
oPPTShape.Table.Cell(2, 2).Shape.TextFrame.TextRange.Text = Cells(2, 2).Text
oPPTShape.Table.Cell(2, 3).Shape.TextFrame.TextRange.Text = Cells(2, 3).Text
oPPTFile.SaveAs strNewPresPath
oPPTFile.Close
oPPTApp.Quit
Set oPPTShape = Nothing
Set oPPTFile = Nothing
Set oPPTApp = Nothing
MsgBox "Presentation Created", vbOKOnly + vbInformation
End Sub