PHP/MySQL help required for Freelance Manager script -- 2

I use a project management script on codecanyon to use with my projects - [login to view URL] which requires some customization to meet my needs. Requirements: 1. I need to have the ability to assign multiple (2 or more) clients to a single project. I need clients to use separate login credentials but have access to the project details as allocated by an admin user. Currently the script does not allow for more than one client to have access to a single project. Please also note that the invoicing should remain separate for each client. Each client should retain their separate billing. Try creating a new project when logged in as admin on the demo page. You will be given the option to assign a client to the project. The script only allows you to select 1 option. I need to be able to select multiple clients. If the above is not clear, here’s an example: Admin user creates a project called Project42. Admin user assigns the same project to two different clients Mr Smith and Mrs Jones. Both clients have visibility of Project42 and carry out the normal functions (messaging, submitting, authorising etc…). When it comes to the invoicing however, Admin user creates 2 separate invoices – InvoiceSmith (only visible to Mr Smith) and InvoiceJones (only visible to Mrs Jones). Mr Smith should not have visibility of Mrs Jones’ billing / financial transactions / invoices related to the project 2. When Admin updates a project with tasks – all clients assigned to the project should have visibility of the tasks. What I need from you: 1. Read the Requirements above and submit your bid with appropriate timescales. 2. If awarded, I will give you a vanilla copy of the script as mine is heavily customised – you will need to install the script on your own server. You will not have access to my server. I repeat – no access to my working script. 3. Show me a complete & working a version of the above requirement. I will need to be able to access the admin area to create multiple clients and projects to see if all is ok. 4. If / when approved, I’ll release a partial milestone payment. Please note – I will not release the complete payment – partial payment only. 5. Submit a detailed guide on how to achieve the requirements detailed above. I will replicate the changes on my own server. Your guide should include detailed instructions on which file(s) to amend with which code(s). This will help if ever I need to update the current script. 6. I will make the necessary amendments / changes & testing on my servers. I will send a link to my website so you can follow my progress. Shouldn't take a day / two to complete - if your guide is any good. 7. Once satisfied Last milestone / payment will then be released. 8. Next Requirements will then be submitted on Freelancer. Please DO NOT BID if you are not happy with any of my terms or requirements. No time wasters or chancers.