Is there a way that the severity level of an alert in Spectrum can affect the priority level of the Service Desk ticket.
For example, a Major severity alarm I would want as a priority of 4 on the ticket, but a Critical alert I would want a priority of 3 on the ticket.
Is there a way to do this?
Out-Of-The-Box there is no exact example matching this scenario. By default all Trouble Tickets created in Spectrum have the priority "0" (configured in the "service-desk-config.xml" file), so not considered to assign a priority in a Spectrum triggered Service Desk ticket.
In the Spectrum Guide there is a section on how to use custom ticket creation rules ...
Customizing Ticket Creation and Closure - CA Spectrum - 10.1 and 10.1.1 - CA Technologies Documentation
... and an example on how to "Create a Ticket Creation Rule Based on Alarm Attribute". It seems the Alarm Severity attribute is "0x11f56".
There is also still the following Knowledge Base article around this topic:
This might help you to find a way to realize your goal.