Order confirmations with several users

Hi

We have a scenario where one or more users will work and confirm the same operation, with the same quantities and at the same time (2 or 3 workers working in the same task) and the system should handle and save those information, because the customer would like to track every confirmations.

Did anybody face the same situation ?

Do you need a new table "Z" to save the users of a confirmation or is there any way to save it without a new table ?