I have some customers in my site. My ERP system has customers along with their price reduction level. I extracted from my ERP the list of customers' Tax IDs and price reductions levels and I want to upload it in a custom table in Wordpress. Any idea how to automate that?
I'm not really clear on what you want to do, but there are several CSV import plugins. http://wordpress.org/extend/plugins/search.php?q=csv
But if you need to link the imported data to specific, existing posts, then it is more of an MySQL question and not purely WordPress.