Today it's possible to create a new and view the created requst from work order jobs.
It should be possible to add a new line on work order based on existing request (only request in stage open or without work order)
Work order status should control when it's allowed to create new line based on existing request.
I guess it would be easier to add request as work order line from then menu Maintenance request than +Add line since the menu Maintenance request is a part of AAM.
If the request have functional location and asset the planner only need to add the job type, variant and/or trade recording to business demands.