Help usually is made at the end of a project. Still, after that there probably will be made changes and additions. Forms may be changes, new dialogs added. Version 4 does not support automatic merges of changes to the existing help (this is planned for a later version). There are two ways to work around this:
Use 1. if you only want a few new pages added.
After 1. or 2. has been done you have to Set Help file and contextId
The above solution does not solve all problems: