Multiple htmlhelp files

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Has someone tried to make multiple htmlhelp archives from one document? 
Would you please give me link or info?

I am writing a documentation to a program that consists of more modules. 
It is provided in more versions with different sets of modules. Customer 
should receive only those parts of help s/he needs. One CHM file can be 
automatically included in another as a sub-node. So I need to make 
multiple CHM files from one document.


Viliam Bur