You can't have two for the same application.
If you are set on adding a new storage node,
- You will need to then create new AGs to point to the storage node
- New applications to point to the new ag
- Update your folders to have the old and new ags mapped correctly
- All the CRT rows that have the old ags and app names would need to be updated.
Then it would flow to the new Storage Node for all new archives. We have over 4000 collection names in our main storage node and don't have any problems. Not sure why you need a new storage node unless you are changing the media (OAM,TSM,Cache)
If you are set up using the Report Specification Exit, you can update the collection names and add the new names to the existing storage node. The CRT table is only read during the report specification exit not at retrieval. We have done this for cases where we needed to change retention on a particular report.
Hopefully, the latter suggestion is what you are looking for.