controller_hierarchy.rb

class ApplicationController < ActionController::Base
end

class SharedController < ApplicationController
  before_action :foo
  before_action :bar
  
  def foo
    #stub
  end
  
  def bar
    #stub
  end
end

class OtherController < SharedController
  # inherits the actions from SharedController
end

class AnotherConrtoller < ApplicationController
  # doesn't inherit the actions
end