The iWay Application Adapter for Microsoft Dynamics CRM 2011 On-Premises can perform Create, Read, Update, and Delete operations for entities that support these operations (subject to validation rules). To view sample request and response documents, see Create and Update Operation Samples.

Related entities are part of the entity class from MS CRM SDK. For more information, see the following website:

http://msdn.microsoft.com/en-us/library/microsoft.xrm.sdk.entity.relatedentities.aspx