Thankyou for responding ,i got it and i did it.

thankyou so much.

A library in SAS is a reference to a location that contains SAS files like datasets, views or catalogs.

On UNIX systems and Windows that location is a directory.

Libraries cannot be nested (a library cannot contain another library, all libraries exist on the same level side by side).

It is possible to create a directory as a subdirectory of another, and assign library references to both, but when viewing from inside SAS, that hierarchy will not be represented.

SAS libraries access data. You set a library to some location (folder, database, Excel workbook). You can then references that library name when working with the data in those locations.

You can also check out the free SAS Programming course. Go to Lesson 2, then Accessing Data Through Libraries. Practices doing that with the Excel file, and folder paths.

It is possible to use multiple folders in one library

libname income ('corpsale','retail');

However, if a dataset is stored in both folders with the same name, sas uses the dataset from the first folder.

Seems like you can. Here is an example in the LIBNAME statement documentation: https://go.documentation.sas.com/doc/en/pgmsascdc/9.4_3.5/lestmtsglobal/n1nk65k2vsfmxfn1wu17fntzszbp...

I tested it on my local SAS install and it worked.

libname x ('S:/workshop/data' 'S:/courses/SQLM6/data');

You can add multiple folders to a library, however, if you have files with the same name in multiple folders, sas will only use the first folder where the file is located