The number of reports, documents and other objects are defined at application level using Designer mode. Please see What is 1C:Enterprise article to understand the structure of applications that are built for 1C:Enterprise. As far as I understood you are looking at demo application that is installed together with Training version of 1C:Enterprise platform. You can use other applications, see Application section for example, or create your own either from a scratch or using one of existing applications as a base.