Suburb Categorisation/value

Suburb Categorisation/value

Hi All,
 I have a list of suburbs that my company services, they are categorised by value to the business using a letter grade (A,B,C,D).
When a lead is created I want the workflow to check the project suburb and then assign the related grade to a new field called suburb category.

I've spoken to support but am struggling.

I have attached below the way the workflow for "A" suburbs is set in hubspot, and also how support set up in zoho. The problem is that if i duplicate the workflow and try to edit the instant action to change to suburb "B" instead of "A", it changes the instant action across all the workflows (A & B).

I am currently doing onboarding so i can be flexible about this but i do need to have this categorisation for our internal processes and I would like to use it as part of my lead scoring.

I'm on CRM plus!

Thanks in advance