credit control area

HI,

We have two company codes, XXXX and YYYY where n XXX is sold off, so all the customers need to be assigned to new credit control area of YYY . New credit control area is also assigned to new company code.

My question is will it have any effects for the documents that have been posted, Do i need to check for any more prerequistes here for changing it

There are 700 customers in XXXX, please advice how to upload the new credit control area at a shot can we do it through lsmw, what are the prerequsities. , or do we need manually upload it .

Thanks

SM