I want to make few custom fields mandatory (example - Dev RCA, Stage of Injection, Dev Preventive action) mandatory based on few other custom fields (application, defect impact etc) and they should be made mandatory when I change the status to either 'To Deploy' or Retest or Fixed
You can use a validator to check that the fields are not empty when the transition is executed.
You will proabably need an add on to get the specific validator rule you want.
JSU in particular has a good set of validators that will help you.
They have a "fields required" one that should suit your needs.
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