You can create a Structure, Mainor Normal package using the Package Builder.
Structure packages form the top level in the package hierarchy.. The main package is primarily a container for development objects that belong together. However, you must store development objects in development packages, not in the main package itself. The structure and main packages cannot contain development objects. Several main packages can be grouped together to form a structure package.
The semantic units within the main package are represented by the development packages. They contain the assigned development objects, along with the associated sub-packages if they exist. This is known as nesting.
You create a structure, main or normal package in a similar procedure to the one described below. Only the type of package is different and is specified during creation.
Within SAP itself, the name must begin with a letter from A to S, or from U to X.
The system displays the Create Package dialog box.
If you are creating a main package, then select the checkbox Main Package. This checkbox appears only if you have the appropriate authorization (see Prerequisites).
In the field Package Type, select the type of package you are creating. The type can be Structure, Main or Development Package. This field will appear only if you have the authorizations to create Main or Structure packages.
You have created your package and can now define a structure within it. Generally, you will continue by adding subpackages to the main package. They themselves will contain the package elements you have assigned.