How to set a group of users and not a single user

[matteo_zanardo]

Hi, I need a big help.
Instead of assigning a task to a single user, how do I assign it to a group of users?
Also you can set that the first user of the group that carries out the task, inhibits other users of the group the ability to work on that task?

[amruta_w]

if you share your process here that's better to debug.