hi all,
One of our client want to migrate from Oracle Forms & Reports 10g to Oracle Apex, they have tree menu for their ERP which is a Tree style menu, populates from their custom data for every users with permissions. they want to have same navigation menu to replace with Apex's standard ( left side navigation bar ), how I can as I am already here as a beginner but if I can do this will be much beneficial for me in both, learning and achievement at work. any guide link which can help step by step to done the things and also enhance look of this navigation tree like icons and Items should looks like a link ( actual links on web pages ), how to control navigations within or out of application ( call another application's pages ) etc.
I created an initial sample page with their sample data and want to replace it with Apex's side navigation bar.

thanks in advance to all for their guidance and help
regards