Help with changing the prices of bulk goods

[jose.e]

I wanted to ask how can I change the price of products on prestashop to show on my website, based on their brands. For example, if I sell shoes, specifically nike shoes, and I notice that they have a low retail price. How can i bulk change it to have all shoes of nike brand have an increment in their retail price by 40%. ( so all nike shoes in my e-commerce store will have an increase in their price by 40%). Also, how can i change shipping price for all products in prestashop.