How can we improve WHMCS?

I have brand. I have company registered in India as well As uk . Now in India We have Gst and in Uk we have Vat know we need to have a solution where we can create country wise.

So this would give us ease to manage same brand instead of creating multiple brand as the major issue for all of us Is

Suppose In India we have

ABC corporation which has Gst india
and Uk we have
ABCD corporation WHich has vat In london

But the companies is selling products under one brand name ABC

As ABCD is subsidary of ABC

So need a multi country Billing solution