Notificating overlapping operations

I have 3 operations, where operations 1 and 2 are overlapped.

I need that notifications 1 and 2 could be done independent of each other. I mean, the system must allow me notify this scenarios:

- first operation 1 and then operation 2;

- first operation 2 and then operation 1

Can I do this using overlapped operations?? What settings do control this?