Simply style your chapter headings with regular Heading 1. Your first chapter heading is a “singleton”: it is a standard chapter heading with an “accident” (meaning supplementary formatting details which occur only once in the document). This is one of the rare exceptions to the rule “no direct formatting”. It is perfectly acceptable to “patch” this occurrence of Heading 1 with a preceding Insert
>More Breaks
>Manual Break
to designate a page style (necessary even if it is the same as the preceding part) and a starting page number.
Thus all chapters are styled with Heading 1 and you have no more problems with Tools
>Chapter Numbering
.
A second example of tolerated exception is your unnumbered “INTRODUCTION” (considering “Chapter 1” is provided by the auto-insertion of Tools
>Chapter Numbering
). For consistency, Tools
>Chapter Numbering
is activated in the master document and every sub-document. Consequently you get “Chapter 1: INTRODUCTION”. Put the cursor at left of “INTRO…” and press Backspace
. This direct formatting removes the number for this heading only. This direct formatting survives the transfer in the master and you have the unnumbered “INTRO…” there. Next Heading 1 will be numbered “Chapter 1: XXX” as expected.
As you noticed, Tools
>Chapter Numbering
accepts only one paragraph style per level. The direct formatting exceptions described above allow you to tune formatting and numbering in marginal ways.
Direct formatting is not prohibited. It is recommended to avoid it whenever possible. There are rare cases where you can’t do without. You need then to be fully aware of the consequences and really know what you’re doing. @mikekaganski wrote in an answer or a comment that using direct formatting needs expert skills contrary to common belief. He’s right. Direct formatting is like spices: use with moderation otherwise your dish receives an awful taste and can no longer be eaten.
In your case, if and only if your first chapter is unnumbered and is the only one of its kind (unnumbered + page number reset), this can be handled with a specific user paragraph style attached to outline level 1 (I suggest it inherits from Heading 1 so that any formatting change in Heading 1 is automatically forwarded to it). But this user style must not be cited in Tools
>Chapter Numbering
. Being attached to outline level 1, it will be automatically collected in the TOC.
It is up to you to choose between simplicity/consistency with direct formatting or full style customisation.
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