How to add Sales Employee Details in Customer Master Data

Hello Gurus,

The requirement is that my client is in manufacturing and sales. And they have different sales person assigned (like territory manager and accounts support) for respective customers. My clients needs to have the name of the territory manager available somewhere in CMD so that the end user is aware about the sales support representative. How we can configure it? If yes, will we use LSMW or MASS to upload the data. Please suggest. And we dont have a HR module in Place, so do we use T COde VPE1 (or PAL1) and then asign it parnter function or is there someway else. Eg - My customer number is 1000, in the same master number, details of sales employee with the phone numbers and email address should appear.

Regards