Its is often done that multiple locations/branches of the same customer are created as different customers in SAP.
In such case the credit limits need to be maintained for only main customer and rest all the branch customers are needed to use this credit limits even if the sales are done using all the customers.
This can be achieved by assigning a customer as reference for credit control for several customers
Let us assume that in the below example 137110156 is a head office and 137110267 is branch
Main Customer whose credit limit is to be shared
Now suppose that customer credit limit of Customer 137110156 needs to be shared for customer 137110267 also
Execute FD32 and enter Customer 137110267
Select Goto –> Control Area Data –>Status
Now go to Edit –> Change Credit Acct
A pop up message as follows will get displayed
Enter the customer number 137110156 in the below screen
Now the credit limits are managed from credit limits of customer 137110156
To recreate the data run the f.28 report
Its done. Now when sales transactions will be created, only credit limits of customer 137110156 will be updated.