I have an issue that I can't seem to resolve. A friend is running a WordPress site in combination with Shopperpress as a shop. He had that developped a couple of years ago, but isn't satisfied with the result, so I am trying to fix things for him.
Anyway, the shop now works well, however there are thousands of products (posts) in the shop and edditting can be a pain. Therefore we'd like to add extra columns to the overview. The data for those columns are in the MySQL table wp_posts, just like most other columndata such as posttitle. The previous developer succeeded there partially. However:
1. I'd like to add more columns (also in the same table as wp_posts) e.g. SKU
2. When I click filter, all extra columns get lost and I get the standard overview. I would like to add the custom columns there as well.
I've searched a long time, but I simply can't find the files to edit. I assume there is some file generating both tables / columns and I guess there is some class / function fetching the results from the query. But I am lost.
Could anyone direct me to the files to get started?
Thanks in advance.