Cost Centre and Internal Order- Urgent

Scenario : Laptops purchased for a sales man, it will go to Sales cost centre and Maintail internal order for this asset.

If furniture purchased for office maintenance it will go to Administration Cost centre like this.

For Laptops i budgeted for 200000.So i am doing this through internal order.Please provide the steps and in which places i have to configure to do this from starting stage.

What are the steps followed for this scenario in detail. I need step wise.