Creating and querying relationships between the nodes of Neo4j SubGraphs

Hi All,

I am using neo4j 4.1.0 and trying to use the subgraphs concepts inside the main graph.

Created different subgraphs and assigned roles and users to individual subgraphs and its all working fine as per the documentation.
However, to use each subgraph(database) I have to choose use: DBS, and then only I can see the nodes inside the database.

My Requirement: suppose I am an admin of all the subgraphs and once I logged into neo4j DB as a super-admin can I access all the nodes in all the subgraphs available and create a relationship between the nodes available in different subgraphs. Is it possible through cypher or apoc library? any idea or guide would be helpful