Sum several records in another table

I am new to Airtable and I am not very gifted :-): .
I would like to sum several records “prix” by name of the person

I try to link theses fields in another table without success.
I’ve seem this post Sum Numbers by Group then use results in a formula - #2 by Neads_Admin
Can you explain me it better ?
Thank you :slight_smile:

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