Re: Automatic creation of subsection below a heading in documents
If the hierarchy is based on heading style (H1, H2,..) then it will be more flexible and pleasant to look. By this way, the entire document will be structured, with sections -> sub sections -> sub sub sections and so on.
Integrity knows the item category only when it is saved. So this sectioning has to be performed during saving an item.
If their is a possibility of this trigger slows down the operation, then a menu shall provide to "Format Sections" of entire document. This is almost similar to doing format of HTML/XML source code 🙂