Hey Matt,
There should be a couple of ways to do this. Both involve creating a template by placing a bookmark in a text box. The first and easiest would be to use the bookmark as a template with the Report Generation Toolkit and add the information from Excel that way. The second would be to do basically what the RGT is doing using ActiveX but all yourself. This way you will have more control over what is actually happening. It is possible to get ActiveX references to the bookmarks in LabVIEW, which you can use to write the information.
Please let me know if you have any questions!
Andy F.
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National Instruments