How do we change due date based on priority

How do we change due date based on priority

Hi,

I have set 4 SLAs for security incidents and I have set Priority to change as per conditions defined by us. In the servicedesk request template, there is a field to set the default SLA in the workflow. Once this is set, all requests temporarily set the due date as per that SLA. How do I make the due date change depending on the priority set? 

                  New to ADSelfService Plus?