Single project with multiple modules

Hi Admin/PHPRunner Gurus over here I came across performance and time issue when the project is growing bigger. My question is is it possible to

1. Divide a big project into small projects (Employees Management)
   
2. Project hare the same database and shared tables.
   
3. Each module will handle specific aspects (ex. Module1: Employee Info. // Module2: Work assigned and related tracking // Module3: Inventory of company and issue info to different employees and department // Module4: Company Information // Module6 XYZ etc.... etc...)
   
4. When the project is developed there should be a single permission management table for all the modules together. so that we can turn on and off some modules for some employees. ( I know it can be done on a single project, but question here is an integrated development of big projects)
   
5. It will save considerable amount of time in executing the phprunner processing time while generating pages and will be fast
   
6. Other benefits of this may be suggested by others which is not mentioned here!
   
   Is it possible to achieve this?
   
   In simple word multiple project with same database and data sharing but developed as individual project and managed as a single Project(Login / Table permission management etc...)
   Thank you
   
   Smith