You can use the feature to re-invoice analytic costs and use an analytic account for inter-company sales. (it's not based on sale orders but on invoices)

You can use sale_journal to automate it a bit. The following quote is from the modules description:

It also supports batch invoicing methods that can be configured by partners and sales orders, examples: daily invoicing monthly invoicing

i've never heard of such an existing feature. If you want/need it, you'll have to make your own module for that