Good Afternoon Sir.
I have gone through your requirement thoroughly. It's a good , interesting Job.
Basically a Group - Subgroup control ( like a tree structure) with all facilities in each group & sub group.
I am expert in Software Development with 9+ years of hands in experience & also have Master's Degree in Software Engineering also. So,
I can suggest you to believe on me & to assign me the Job & see the Demo Software at first.
I am Confident you will be satisfied with software Quality, Cost & Time Duration.
I will thoroughly communicate with you and show you step by step development report as per your requirement quickly.
That's why you should assign this Project to me.
So, you are always welcome to ask me any question & award me your Interesting job to me only.
Have a nice day. Thank you & Best wishes for the Project.
Tanmay Roy.