I have three users (A, B and C) and set workflow for items.
The workflow process is perfectly working as I expected.

In this case, I'd like to set workflow only for A user and other users (B and C) will not use any workflow process even the process was already assigned into content items.

So, A user will follow the process like "submit", "approval" and "publish".
B and C users will not use workflow and they are not required, just change and publish.

How can I do this??? I guess I need to update workflow permission in security??