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Re: Problem facing with MailMerge.ExecuteWithRegions

Thank you for your interest in Aspose.Words. There is no direct way to populate a document with data that has parent-child relationships. Mail merge regions can only process one data table at a time.
Bu you can achieve this by performing mail merge several times and building up a resulting document from several documents or fragments. The Product Catalog and Sales Invoice samples in the demo project supplied with Aspose.Words demonstrate the suggested techniques.
Best regard.