Hiding the irrelevant applications

Hi, I want to remove the irrelevant applications/Component . How to do this??? Also, can we extend an service and share to third party application for access .

Regarding Customization of Account and Billing Software

Dear Team, Kindly , share the manual to customize the accounting and Billing solution. How to use existing accounting system of offbiz solutions and api is available in offbiz. Regards, Atul