Merged WebHelp systems have several advantages and benefits. Below are some of the advantages of merged WebHelp systems:
Ability to author individual projects and merge them at runtime.
Ability to have a unified Index, TOC, Search tab, Glossaries, and Browse Sequences.
There is no limit to the number of sub-projects you can reference in the master.
A master project can also be a slave to another master project.
The merging of sub-project can occur anywhere within the structure of the Table of Contents.