Working with Products and Software Components 
The SLD contains a Software Catalog of all installable SAP products and software components. The Software Catalog includes information about support packages and dependencies between the products and software components. This information is the basis for the description of the system landscape.
For more information, see Software Catalog, Products and Software Components.
For more information, see Viewing the Software Catalog.
For more information, see Creating and Removing Third-Party Products.
For more information, see Creating and Removing Third-Party Software Components.
For more information, see Defining and Removing Software Dependencies.