Contact OCLC Support to request the merging of 1 or more collections.
Include the following with your request:
Special Requirements
For collections to be successfully merged, the field nicknames of both the Source and Destination collections must match 1:1. You can find the list of field nicknames (<nick> tag when viewing XML) for collections by using the REST API dmGetCollectionFieldInfo.
The Nickname Tool can be used to update the nicknames for the collection fields so that the Source and Destination collections match.