Retracting task in process workflow

Hi experts,
I'm currently working on how to retracting task in specific workflow.The situation is like this:
User A initiates form then assign it to user B (task B). User B completes (task B) then assigns to user C (task C).
In case user B forgets some details, he wants to retract the form from user C so that he can edit form and resubmit it.
What i can think of is to create a separate process and use a custom component to reset the status of this process.
From what i observe, before and after completing task B, there are changes in tb_task, tb_job_instance and tb_branch_instance (if you think there can be changes in other tables, please let me know, thank you).
I have tried to delete task C in tb_task, set task B's status from COMPLETE (100)to RUNNING(3) and it's complete time to null. User B can see the task but after complete, it never appear in user C's task.
I realized that after task B is completed, its associated job in tb_job_instance is deleted and task C and its job are created.
Is there anyway I can create a job in tb_job_instance to link with current process, so that after user B complete the task, the form is routed to user C.
Any comment will be much appreciated,
Thank you,
Tuan Anh

Hi Jasmin,
Now i'm trying to build a custom component to invoke the Retract route. Currently the task is assigned to user A.
but i don't have the password of user A. When I use Administrator account to invoke taskmanager.completeTask(204,"Retract"), I have this error:
com.adobe.idp.taskmanager.dsc.client.task.TaskPermissionException:
User: 43296024-F721-D137-5FDF-D01FF8A70682 is not assigned task: 204. The task cannot be completed
Is there any way I can complete the task without knowing A's password ?
Regards,
Tuan Anh

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