In addition to Yasuhisa's excellent post - there is no 'catalog import' function in NBU.
Catalog backups can only be restored to exact same type of master - same OS family, exact same NBU version, clustered to clustered or non-clustered to non-clustered.
The problem is with the clustered vs non-clustered EMM database. There is no way to convert existing database. As Yasuhisa said - this can only be done with specialized tools that Symantec only issues to specially trained catalog manipulation consultants.
See http://www.symantec.com/docs/TECH31385
Extract:
Symantec has developed comprehensive methodologies to handle a variety of reconfiguration requirements including the following scenarios:
- Migration from an existing master server to a NetBackup appliance master server
- Merging of two or more domains
- Splitting of a domain into two or more domains
- Clustering of a non-clustered Master Server
- Renaming of a Master Server or Media Server
- Moving a Master Server to a new machine involving a host name change
- Moving a Master Server to a different platform/operating system (Windows to Linux/Unix or Linux/Unix to Windows)
- Un-clustering a clustered Master Server
A number of Symantec consultants and Consulting Partners worldwide have been trained on these procedures and certified to deliver them in accordance with standards required by the Symantec technical support organization.