Hi Ahmed,
Please create a new condition type in SD ( Check with your SD consultant), and create an account key and assign it to condition type in "Assign account keys"
maintain the same GL account in VKOA in account key combination.
After the above settings please create a sles order (VA01), post goods issue(VL01N) and billing VF01 system will post to that particualr GL account after billing.
Follow the above process and let me know if you need any further help.
Regards,
Ravi