IT infrastructure operations 24/7 model Escalation matrix, Helpdesk team setup L1L2L3 .

Hello , I want someone to prepare an escalation matrix document and template (PPT) to IT infrastructure team like L1,L2,L3 ,L4 support with workflows ,service desk flow chart model , 24/7 Model ,with help line no .ITIL 4 process . Ex: We have a 20 Member team which we need to set a Help desk for IT Infrastructure operations -24/7 working model, Workflow , Escalation Matrix Teams Server Team L1 team Storage Team Linux Team Cloud Team Network Team Management Hierarchy as follows Team Member-->Technical Manager-->Project Manager-->Head of IT Operations