How to assign an order to the subcontractor/suppli

Hello everyone,
I am new to Dolibarr and would liek to use Dolibarr for a project. I will try to explain the context and i hope i will find an answer here.

I am runnig a freight forwarding company. We offer to our clients and prospects one service - transportation - that is made by our subcontractors/suppliers.
How can i assign (or link to ) the order from a client to the supplier

Practically it looks like this for example.
I receive the order for 1000e from the client - i am assigning this order to the supplier for 800e.
Once the transport is done i can see the margin 200e. …

Thank You for all answers…

That’s a very simplified description of a complicated process with a lot of paperwork.

Unless we are only talking about a courier service, then we need more info - and I guess you should talk to one of the Dolibarr Partners for an implementation.