How to create an activity dynamically?

 

We are using Biniota 6.0 with PostgreSQL database.

The Scenario is like this

We have defined a process where we have three activities A, B, C in sequential order.

Suppose we are at B and due to some reason we have to go back to A and start the activity.

But we didn’t defined  this condition in the process.  

Is there a way I can create activity A dynamically?