How to change the price during import - set multiplier / markup for prices?

To set the price markup, click on "Show/hide settings" in the price adjustment field and then fill in the "price markup" field. During import, the price from the file will be multiplied by this value.
More price operations such as:

• Modifying
• Markup and margin handling
• Rounding

You can perform using the PriceMaster module:
https://prestashow.pl/pl/moduly-prestashop/18-price-master-wygodne-zarzadzanie-wszystkimi-cenami.html