The Qvera Interface Engine does not have an automated way of consolidating CDA documents but can be configured to do so.
You would need a back-end database to store the inbound data and to create the Consolidated CDA.
An example of how you would do this would be to cycle each section of the inbound CDA (eg Problems, Meds, Allergies) and for each item found to check the back-end database to see if that item already exists for that patient. If it does not exist you would add it to the database for that patient. Once all items have been processed from all inbound CDA documents you would then have a consolidated view of all the data across all CDA documents in your database.