Add more feature to current web application

I have a tailor management system app written in php (codeIgniter) I Need to make the web application as SAAS: First you should create very simple page for admin containing companies and button to create company, the admin should be able to create new company and create users for the company, each company should have many branch on it, the company has manager which he will be able to create new users for the branches and new branches, Each branch should have its own users and shares the same customers, You also have to create new roles and privilege on the system as : admin -> operation -> : * company manager -> branch manager -> Data entry and accountant and others, * tailor The current application is for the branch it contains everything needed(orders, purchases, inventory, dashboard, etc..), you will have to add very very simple page for admin and one for the company manager and manage the db for converting the app as SAAS which include each company has subscription etc... Watch the below link for the current system: [login to view URL] The payment will be for finishing the complete work not 90% of it. *Note: need someone has experience in php (codeIgniter)