Hi Jonathan, 

If you're looking to fill fields in a Word document template with its properties, you'll need to first create a way for Laserfiche to access the properties themselves. It might be possible to use the Office SDK to script something to extract the MS Word metadata, but since this isn't Laserfiche functionality, you may have to ask Microsoft how to access that information. From some quick research, it looks like Office documents are stored in an Open XML format that allows you to retrieve document properties. This might be a good starting point for getting the metadata to pass to Laserfiche.

Once you have the MS Word metadata passed to Laserfiche, you can then use Workflow to update a Word document using Field Merge. This functionality is new in LF 10, and the help files provide more instructions for how to use this tool. Hope this helps you get started!