I am looking to import old/closed Sales Orders from our legacy system.  I cant figure out a way to do that through the oerp import function as the status 'done' is not importable through it and any import automatically starts out as draft.  

I solved this problem for Products (to add quantity on hand) by importing thorugh stock_move and writing a quick module which added the stock_move.action_done function to the 'More' menu in the Stock move tree.  I dont know that this way of doing things (i.e. calling sale_order.action_done then ? for lines and ? for invoices) will work for sale orders, sale order lines, and old invoices.  I need customer service to be able to search through these, but as they are all already reconciled they shouldnt affect the accounts.  

Any advice would be helpfull. If I have to go another rout than the built in import functionality please help with links to tutorials or something.