Sales Tax in Axapta 2009

Hello All,

We have to pull all the sales orders from external system into Axapta 2009. Each order has calculated tax as per there rules and policies. So, how to push sales tax into sales order in Axapta 2009 without axapta sales setup. I want to post the tax of each order into legder account without using complete sales tax setup because external system is calculating tax for each order.

Any ideas are appreciated.

Thanks,

Sayeed