So the inline ref would look like this: <ref>Birth, Death, Marriage, Parents Programme de Recherche en Démographie Historique, Université de Montréal (paid subscription){{PRDH|Individu|16054}}</ref>
Where I enter what I want to say about the source, then the template goes in the brackets and then I close it with the /ref? and I would of course, enter the correct ID number.
Oh I got it, just {{PRDH|Individu|xxxxx}} produces what's in the table.
Thanks for your help. Yes I understood the reason to have it, just not the logistics of usage.