I will do, thanks !
I've just retried with the Paragraph styles and the copy/paste is not working on multiple lines....
As there are many adjustments when my client updates the file, I used to copy/paste directly from the Excel file directly into my Indesign project so it replaced the content with the new one and keeps the text style. With the Paragraph Style it just use the style of the first line and apply it to the whole pasted text...