Structuring of reports by using the report container is a pure Designer feature. Therefore there is no difference from the "normal” list as shown in section Simple List
For using sub tables, it is required that parent and child data are relationally linked. So the first step is to design a table element for the parent table in the report container. The next step will be to add a sub element with the child data by the toolbar in the "Objects" window.
At print time the corresponding child sub report will be automatically added for each record of the parent table. For example, the List & Label Sample Application (in the start menu's root level) demonstrates this under Design > Extended Samples > Sub reports and relations.