* This feature requires the
professional edition.
1.
Create
an empty Word document as a master document.
2.
Insert an existing document into this master
document.
3.
Repeat
the step 2 to insert all related documents into the master document.
4.
Save
the master document.
5.
Run
Word-2-CHM and select the saved master document.
6.
Enable
the option “Merge Sub Docs”.
7.
Click
the 
button to create the CHM.
[Suggestions]
Using either of following rules is
recommended:
1.
Formatting
topic headings with heading 6 to heading 9 styles in the master document.
2.
Or set
the outline level to start with 6 in the master document.
In this case you do not need to adjust the
outline level of sub documents. The only thing you need is to set option Custom Root Level to
“6-9” to promote the outline level of the master document.