Extend mass customers to a new company code and sales area in SAP S4 Hana

Hello SAP Experts,

Currently I'm moving connected 1 rollout (SAP S4 Hana) task wherever I created a caller institution code, truthful for that I person a full 3500 customers, and each of those customers I privation to widen to the caller institution codification and income area. 

So for that, I request a solution. Can anyone archer maine in detail however I tin widen each these customers to 1 institution codification and income area. 

Thanks and Regards
Abul Hasnat