On the Maintenance Request Type you can define the default Work Order Category and Work Order Priority Code. \
These values will be applied to the Work Order creation wizard when you are creating work order directly from the specific Maintenance Request. These values can be always changed manually.
If you will not set up Default Work Order Priority Code but you will set up Default Work Order Category Code and you will set up Default Work Order Priority Code for selected Maintenance Request Priority. The Work Order Priority code from Maintenance Request Priority will be used.
If you will have only setup for Default Work Order Category Code and no Default Priority Code on the Maintenance Request Type, or Maintenance Request Priority - default Work Order Priority Code from the Work Order Category will be applied.
If nothing is set up in the Maintenance Request Type - default values from the EAM will be used.