How to properly set heading numbering to include supplement?

Questions
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5

I simplified your solution slightly, so it’s easier to read:

#set heading(numbering: "1.a")
#show heading.where(level: 1): set heading(
  numbering: num => "Example " + numbering("1:", num),
  supplement: "Example",
)
#show ref: it => {
  let el = it.element
  if el == none or el.func() != heading or el.level != 1 { return it }
  let heading-levels = counter(heading).at(el.location())
  let body = numbering(n => [#el.supplement #n], ..heading-levels)
  link(el.location(), body)
}
#show ref: emph

Also note that you can use - in label/function/variable names, which is also a conventional way to name things. So the <sub_four> would be <sub-four> and the reference would be @sub-four.

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