Creating a new topic in an opened project can be achieved via two ways:

By default, a new topic is added at the bottom of the table of contents and becomes the last topic overall. HelpNDoc can optionally create a new topic at the following positions:

These actions are available from a sub-menu which can be accessed via the following ways:

When a new topic is created, its title will become selected and editable for easier modification: it becomes faster to create multiple topics and rename them.

See the How to create a new topic in HelpNDoc step-by-step guide.