Hi all

I have:
- many tasks and among them one task T1 which starts on 07/01 and end on 09/30
- many resources and among them one resource "John"

"John" can only work on T1 on those time slots:
- from 07/10 to 07/20
- from 08/15 to 08/30

I would like to assign John to the task T1 only the given periods.

Does anyone have any idea how to do that with Project?
The only thing I found is the "Resource usage" panel and the possibility to enter a fix duration for the resource on the task.
I was not able to enter different time slots for the resource

Any help would be appreciated
Thanks