In both Blueprints and Materials there are a number of groups of nodes or a sub modules used quite a bit. There’s also a number of handy more elaborate node sets.
Right now the options are to build something from scratch node by node or find a full blueprint somewhere else. Something like a macro/function level. Imagine https://blueprintue.com/ but organized with commonly used snippets that would be available in you local library/popup. Many program test editors have snippet libraries for common structures and for you to add your own.
These would be available so each project would have access.
There’s also rare or less used nodes that requires digging through videos or a number of documents to rebuild.