@mrmikel
Gleaned from a series of your posts:
You are fighting a system that works fairly well.
Sigil split will adjust links to all existing files
(NB deleting a file that has a link will result in a broken link that will need repair by hand)
Using Sigil split :
Immediate: Ctrl-Enter
Insert Marker (for later): Ctrl-Shift-Enter
Split at Markers: F6
id on <h# tags are not needed if you use chapter per file as Top of file is assumed for the TOC
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