Hi David,
Thank you for your interest in Syncfusion products.
Create Mail Merge Field:Please refer the below article to know about the Mail merge.
http://www.syncfusion.com/products/docio/windows/Articles/Mail_Merge.aspxSteps to create Mail merge fields in MS word:1. Open any word document
2. Goto to Insert menu [Insert-->Field]
3. Select the Mail Merge category, now enter the Fieldname like FirstName ..
4. For inserting next field, Goto step 2
Please refer the below sample from the sample Browser for Mail Merge
Syncfusion\EssentialStudio\x.x.x.x\Windows\DocIO.Windows\Samples\2.0\Mailmerge
Please let me know if you have any other questions.
Best Regards,
Bhuvana