Simulink function block reusable and editable

Question

I would like to create something as a subsystem (let's call it block B), that I could use and, when I edit it, it could update every block B in my model.

I'd like to create something like a mask that I could reuse and edit.

Answer 1

You are searching for two different features of simulink:

1. Library

   Mathworks-Documentation: Working with linked blocks

   To edit a block "somewhere" you have to disable the link, make your changes and resolve the link again. After updating you model (ctrl+d) or updating the links (ctrl+k) the updated lib content is in every instance of the lib.

2. Masking of Blocks

   Mathworks-Documentation: Simulink masking

   Masking has nothing to do with libs. But you can mix up both features.