How to change how priority calculate?

[Mytno1]

I'm working on how to change the way priority calculate. I already know how to change it based on other field, but my boss said he want to take it "dynamic".

I created a field in choice list called [u_important], which value range is from 1-5.

Now I want to everytime I change the value of category, the priority change as well (not like newValue =="network" > setValue), more like to get the Value of [u_important] from choice list to change the prority value.

For example, If I choose 'software', the sciprt go to choice list and see the value of u_important is 1, so the priority change to 1 as well.

Whenever I choose another, the priority change equal to the value of u_important.

I'm not good at javascript, thank you.

[Dubz]

You don't need javascript to do this. The priority on the incident form is set by a data lookup, you can either amend that one or create your own.

The documentation here explains how to create a new data lookup and you can lookup at how the OOB config is set up by going to system policy > rules > data lookup definitions (and priority lookup rules)

[Mytno1]

Tks, but I don't really understand how that data lookup definitions work. 

How should I use it:

[rahulpandey]

Hi, You don't have to code for this, this can be configured using data lookup. Check below https://docs.servicenow.com/bundle/london-it-service-management/page/product/incident-management/reference/r_PrioritizationOfIncidents.html

[Mytno1]

How should I setup the My Lookup Definition pls?
here is my