[lomkiri]

Here is an exemple how you can renumber your paragraphs, using "search all"
Change what you want (different titles?) in the regex-function. The numbers wont appears in your book (only in the ToC) if you put in your CSS the class:
.toc_text{display: hidden;}

I've put (in the function) :
" chapter n" for PAGE-BREAK
" cn n" for CN
" level n" for CO
change it to fit your needs
_________

Search (select "regex-function"):
find:

class="((?:CN)|(?:PAGE-BREAK)|(?:CO))("[^>]*>)([^<]*)</p>

function:

def replace(match, number, file_name, metadata, dictionaries, data, functions, *args, **kwargs):
    if number == 1:
        data['pg_br'], data['cn'], data['co'] = (0, 0, 0)
    span_d = '<span class="toc_text">'
    span_e = '</span>'
    
    if match.group(1) == "PAGE-BREAK":
        data['pg_br'] += 1
        n = data['pg_br'] 
        text = f'{span_d} chapter {n}{span_e}'
        
    elif match.group(1) == "CN":
        data['cn'] += 1
        n = data['cn']        
        text = f'{span_d} cn {n}{span_e}'
        
    elif match.group(1) == "CO":
        data['co'] += 1
        n = data['co']
        text = f'{span_d} level3 {n}{span_e}'
        
    return f'class="{match.group(1)}{match.group(2)}{match.group(3)}{text}</p>'

It's important to choose "search all", if not, the numbers won't increase
I've test the regex-function and the creation of the ToC (with only PAGE-BREAK as H1 and CN as H2), and it's working, here's the result of the test (screenshot)

Edit:
If you want that CN reinitiate at 1 after every PAGE-BREAK, or something similar, say it, it is easy to integrate this in the code.