how to setup service Desk application to auto assign tasks to the same technician assigned to the request?

how to setup service Desk application to auto assign tasks to the same technician assigned to the request?

to provide a brief description this is what we are doing: 

We create a request template what needs to be approved in order to be worked, but after the approval the same person who approve it has to assign the Technician, this step is doing manually by the approver due to business needs. the Tech is successfully assigned to the request; however the triggered child task associated to the request are not being assigned to the tech

what we want is to get those child tasks auto assigned to same the technician when the approver assign them the request.

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