@buechler66
You need SAS Management Console (SMC) to define libraries in SAS Metadata. Such definitions are permanent and static. They make sense for library definitions which are used in many programs and/or many users.
Which user can see/use which library defined in metadata is managed via metadata security.
More detail here. It's for SAS9.2 but the content is still valid:
https://support.sas.com/documentation/onlinedoc/guide/EG43MetaLibraries.pdf
A library in metadata can be pre-assigned. What this means: The definition gets executed during SAS invocation and the libref can then get used in code without any further code. If the library is not pre-assigned then it still shows up in the EG explorer but needs first assignment either manually (right click on the node in the EG explorer and choose "assign") or programmatically (libname statement using the Meta engine).
