If I use the DetailLine function using an API called PostCommand, is there a way to access the option value called Chain to give, fix, or change the default value?
I looked up the Rabbit API, but there was no related data
The Revit API PostCommand
method enables you to launch some built-in Revit UI commands. It does not provide any functionality whatsoever to influence their behaviour. The user has to interact with them just like in the standard UI.
No idea what you mean by Rabbit API.