English to Spanish Bus/Financial Manufacturing Non-wovens

Se trata de un documento descriptivo de las actividades de un grupo de sociedades. Entiendo que quiere decir que el cliente recibe servicio de distintas sociedades del grupo según dónde esté ubicado, pero no encuentro una traducción convincente.

La traducción es para España.

"XXX operates in two major markets for wiping materials, i.e. USA and Europe. In addition, from February 2014 XXX operates also in South America. The operations are run on pan-continental basis because of international customers and global sources of raw materials. The sales and marketing functions in the business are organized through a global management of operations and by personnel operating from different entities ***on a cross-customer basis*** when the customer is located in several countries. The key customer sales offers remarkable advantages to manufacturing sites, since the customer contacts and contracts are made on broader basis than for one manufacturing site only.