Subcontracting Project Task

Hi,

We have 2 different companies 'A' and 'B' (different books) using Projects Costing and Billing modules. We have a scenario where company 'A' gets Project from the customer (1 million) and a partial work is given to another company 'B' like subcontract or OSP (0.4 million) 

When Project is completed and invoiced to customer, total revenue shows 1.4 million (Company A 1 million and Company B 0.4 million) but actually it is 1 million from customer

Is there any option to where system can create subcontract project to other company and at main project level, we get revenue as 1 million?

Pls suggest better options or workarounds.