John, Like and have already pointed out, SAS Base Library hierarchy can only have two laryers: Table and Library. However, noticing you are using EG, so there is possibility you can "achieve" the result using Metadata folder structure. You can set up OS alike folders, which can be nested many layers, with very literal naming conventions, and then point your libraries and tables to these folders regardless how they are stored physically. The way I like is to use Metadata library names as the folder name, so when I need a standalone code, I can easily determine the library name (metadate), then call it upon using Meta engine. Hope this helps, Haikuo
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