Answer by Fareed A.S.:
The concept of Fragnets doesn’t exist anymore in P6. It is a feature in P3. In a P3 fragnet, a user can store a set of activities along with their full details such as relationships, codes, costs, resources, etc. and use this stored set to be pasted as an entire group in any number of places with a single click, without having to create the same set again and again. This saved immense time and efforts. One way to do this in P6 is to replicate an entire WBS (or more) and the constituent activities will also be replicated with all the details. If this is supposed to be done across projects, you have to open multiple projects at the same time.