Create groups based on a deal

Create groups based on a deal

Hello there,

Is there any way to creat groups on a deal? for example, on a deal I need a support team made out of a few members of the entire support team and when one of  the members of the team assigned to work on the deal closes a task, all of the other members of the team should be notified.

I am thinking about maybe creating a custom button, but I do not know if this is possible, can you please help?

Thank you!