Hello @Kieran Anson 

currently promote to major incident button is visible only if i create major incident candidate record.

As per my project requirement .. I want to customize ui button.

In normal incident form i have added view workbench ui action..If incident priority is high then view workbench button will visible. If i click on view workbench then workbench page will open . In workbench page i want to add "promote to major incident" ui action. This is my requirement.

Best Regards,

Raj