You can insert customize Help IDs in Word by enable the option “Use CUSTOM field for HelpId and Filename” of Filename Customize add-in.
Steps for insert a customize Help ID into Word file:
1. In Word, click anywhere of a topic heading, press Ctrl+F9 to insert an empty field { }. Use Alt+F9 to show/hide these fields.
2.
The format of the CUSTOM field is like this:
{ mo:HelpId=12345 mo:Alias=H12345 }
The number 12345 is for HelpId. The string H12345 is for filename.
Examples:

Note:
Word-2-CHM creates a HelpID for each heading automatically. These HelpIDs are started from 1001. Using bigger numbers for customize Help IDs are recommended. For examples, use 10001, 10002, etc.
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