Help with Attribute modifier (not the plugin)

So in the new 2024.3 update we got Attributes built into mcreator but I’m confused

There are three blocks: get base value set base value and what I’m confused about get value with modifiers 

So my question is can I make a modifer I would really rather not change the base value as I don’t know what the base value is by default 

If I use the set base value in a procedure does that overwrite the base value OR does that count as a modifer

Thanks y’all sorry for dumb question