trigger a process without submit a form

I have 3 data entities A (Customer Details), B (Contract Details) and C (Outstanding Balance).

A is parent for B, and B is a parent for C.

I have imported the data in to the 3 tables. 

Also I have a group Agents which include multiple user.

Now, my requirement is : to start assigne the records from the data entities to specific users form the Agent group ( this is should be the trigger of the process) to follow up with the customer and add comments. (no updates to records are required)

Any help how can I trigger this process?