Codeunit 5054, Merge Email, Extra Attachment.

In Codeunit 5054 Function Execute Merge is it possible to sometimes add an extra attachment to the sent email as well the merged document. e.g., I might want to sent an extra map.pdf to some lines on a segment.
(The Cal Symbol Menu doesn't show the full list of properties of WordDoc.MilMerge.xxx so I can't see if there is an obvious way to do it.)
WordDocument.MailMerge.Destination := 2;
WordDocument.MailMerge.MailAddressFieldName := Text015;
WordDocument.MailMerge.MailSubject := TempDeliverySorter.Subject;
WordDocument.MailMerge.MailAsAttachment :=
WordDocument.MailMerge.MailAsAttachment OR TempDeliverySorter."Send Word Docs. as Attmt.";
WordHelper.CallMailMergeExecute(WordDocument);