Does anyone know: duplicating a project keeps all links w correct reference, or do I have to ‘relink’ everything? Something like ‘relative’ links would be great…
Yes! The links of the duplicated project will work just as it would for the original version. The only scenario that I can think of that might be differently is if you are using non-page links but published URLs (https://readymag.website/..../). Regular links (page numbers or unique urls should be fine.