hello everyone , I have a custom field in my custom record type. I want to change the value of this custom field dynamically through UI. Is there is a way to do it?

It will depend on what is your criteria to change it dynamically. Client script field change or saveRecord entry point can work for you. Or non scripted/workflow solution is Field sourcing.

I have two custom record types as Record A and record B , In record A there is a custom field named as custA whose value depends upon the value of custom field in record B named as custB , I want to achieve this functionality in netsuite using UI , For example , if the value of custB is "1" , the value of custA should automically get changed to "one". This is the condition