multiple companies under one organisation

multiple companies under one organisation

Dear, 
I have multiple companies under one main organisation. All same VAT

I would like to start to separate them to have a more clear view of how each firm is working.
Also they have different products and different contacts.
They all have different branding, and different language. 

Only one problem I have with adding just a new organisation. 
The invoice numbers of all organisations should be following up eachother.
For example:
Company 1: invoice number: inv001
Company 2: invoice number: inv002
Company 1: invoice number: inv003
Company 1: invoice number: inv004
Company  3: invoice number: inv005

And so on...

Is this possible to make the setup work like this? and how?

It is quiet urgent as I have to send some invoices out.

Thanks in advance.