Hello Hilary,
Many thanks for your reply,
in fact i have changed my optic , i had a library and i changed it to a list beacause i don't want my items to be saved as docs .
Now i have some fixed fields (country,customer,project,business unit) and i want to add a repeating table on which a lot of periods of time will be added to one project , and for each time period i need to assign several resources.(please see below exemple)
could you please help me how to implemnt it .