How to get a list of goods from a transaction in a Bitrix24 business process?

Question

CRM

Hello. The question is this: I want to get a list of goods from a transaction
in a sequential business process , take specific ones, for example, by name and change their price. It was possible to do this only if there is only one product: I get information about commodity items, according to the condition "if the name of the commodity item contains a certain text", then I change the price. But if there are a lot of goods, and not all goods have a discount, I could not yet understand how to implement this. I will be very grateful!