I have figured it out
My goal was when I trying to save 2 seperate forms event and category it must redirect to index page after saving the records in the table
I had events folder for views -> addevent, addcategory, index
so both are forms required to store in diff tables i.e. event table and category table
I had 2 models event and category
I wanted to use only 1 controllers EventsController which can do 2 actions addEvent and addCategory
I could save and redirect to index for "event" but it was not working for adding "category"
cause when the form goes to controller for submission I cannot save the data must due to loading of table for category action.
so I created a empty function for addcategory which is required since category form is in events folder
and created a new controller called CategoriesController where I redefined the actions for addCategory $this->Model->save()
Here the problem of creating a new controller was the url will be proj/categories/addCategory
so since it is in categories/ it wont redirect to index page.
so I used relative paths i.e ../events/index then returned back after saving category to index page.