Hello @Rory Scherer
Welcome to the Atlassian community.
Have you tried to create that rule? If so, show us what you have and tell us where you are having difficulty.
You can find documentation for Automation Rules here:
https://support.atlassian.com/cloud-automation/docs/jira-cloud-automation/
You can also find on-demand, free training on that functionality in the Atlassian Learning portion of the Community. You can access that through the Learning link at the very top of the Community pages.
Here is a direct link to a search for Automation topics for Jira:
https://community.atlassian.com/learning/catalog?search=automation&product=Jira
You must first decide when you want the rule to run? Should it run when the issues are initially created? What about when the Summary is changed? That information determines the Trigger you would use for the rule.
Then you need a Condition to evaluate the contents of the Summary field. Since you want to check one at a time for a set of values you would need to use the If/Else Condition; i.e.
If Summary contains "High"...
Else if Summary contains "Med"...
Else (assumes since the first two didn't match then Summary must contain "Low")...
Nested under each If/Else you would have an Edit Work Item action and in it you would set the value of the Priority field.
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