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Yes, it is possible to perform the Nested mail merge with nested business objects instead of data tables.
Please find the online sample to illustrate the same for Nested Mail Merge functionality using Essential DocIO from the below link. Try running this sample and let us know if this helps you.
Kindly refer the below UG documentation link for more about Nested Mail Merge functionality using Essential DocIO:
Please let us know in case of any other questions.
doc.MailMerge.ExecuteNestedGroup(new MailMergeDataTable("Customers", Customers));
Thank you for your update.
Kindly make use of the below attached template document to avoid creation of the new table. In the attached Word document we have defined the table start and table end for orders inside the table itself so it will append the each row in the table instead of new table. Kindly follow this structure during mail merge process in order to avoid the creation of new table. Please do find the template document from below link.
Please let us know in case of any question.