Welcome!
There is a guide for classical editing here: The Classical Editor Toolbox with links to very useful userscripts, but even without them, you have a button Edit relationships (in the english version) on the rightern side of the release page. There you can edit multiple recordings at once, with checkboxes, you don’t have to go to each recording page and modify them separately. The requiem of Cherubini (both of them) are popular enough that the works are already there. If you don’t find it, look up a release with the requiem already linked and copy-paste the work titles from there.
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