How to set common Customer Credit limit of same customer having more than one BiLL to in different O

In Customer Master

For One Customer we have multiple Bill To Sites in different OU

for e.g one customer have 5 Bill To site on different OU

Business requirement is -

1. Out of 5 Bill To Site from Different OU,  Can we have common credit limit for Two Bill To Site which belongs to different OU.

for. e.g.

There is a
customer source products from Dubai and Saudi, his total credit limit is
$200,000 for both sites. Customer buy from Saudi in SAR and from Dubai in USD.
Please check the following

1. Credit limit apply will consider values in USD
2. It is feasible to apply credit limit by sites together with total