Hi erik ,
Please, read this article: https://stockmanagementlabs.crunch.help/tips-and-tricks/how-to-change-the-characters-number-in-the-product-name-column
The only difference is that in this case you must use the hook 'atum/inbound_stock_list/column_title_length' instead of 'atum/list_table/column_title_length'
P.S. Please, understand that custom code is out of the scope of this forum. If you aren't able to get what you want with the info in this post, you should hire a freelance developer to help you.