How to create multiple invoices for same project with multiple costs or events

Hi Folks,

As we are aware system will be bill Invoice based on costs or events, but we want to create multiple invoices

Ex:- We have one project with service expenditure, Material1, Material 2 , now  Expense cost should have separate billing invoice, Material 1 costs/events should have another invoice, Material 2  costs/events should have another invoice

how we can achieve this requirement