How to bulk edit all classification ICOs of a class

[#1]

We are managing our milling and drilling tools through MTL in the classification.

I have now had the need to add the status attribute to all tool assembly classes with a default value of productive.

The problem is that existing tools are not inheriting the default value, but keep the attribute blank.

What is the easiest and most reliable way to update the status attribute for all tool assemblies?

[#2]

I've use ITK code to modify the attributes. I think that's the best way but it can take a bit to setup if you don't know what you're doing.

[#3]

Thanks for the answer.

I am not fluent in ITK, so I have just done this manually, took less time than I thought