Custom Sections allow you to control, through event rules, the information that prints on a report. We can use Custom Sections to print additional information depending on certain criteria.
Text Variables are used to store strings, which can be attached to the reports using Event Rules. They are used as alternative to hard coding text strings in assignments.
A subsection join is used in specific circumstances to present data from two different business views in the same report using two sections (a parent and a child) each with a different business view attached. You must join your parent and child sections on common key fields
The layout of a columnar section consists of column headings with the associated column values listed under the headings. Each data field is a column, and each record is a row. The column heading is linked to its column data, and the two cannot be disconnected in the report. If one is deleted, the other is deleted also. Because you cannot change the column format, the columnar section is the least flexible detail section.