Hi Ali, Can you provide some Information on how many customer accounts are affected by your planned change? If you only want to change the customer Group association of a small number of customers, you should be able - depending on your user rights - to do this manually. If, on the other hand, you plan to change a large number of customer records, you probably Need some development help and write a Job for changing the customer Group association. Please note that a change of the customer Group might cause some reconiliation issues between AR and GL. So please make sure that you document and test throughly before applying this change.
Al the best, Ludwig