Word Document

Hi, I need some advice: I have created a process model in which a word document is created; in an interface there are fields that can be filled in by the user, plus a dropdown field that lists the word documents created; if the user chooses one of those documents, the interface fields should be automatically filled in with those taken from the selected word document; how can i do it? I add that if changes are made in that interface, the original word file must be able to be overwritten with the new modified fields,
Thanks to those who will help me

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