How to display the necessary information from the filter?

Question

1C-Bitrix

the task was this: to make it possible to add "prices from" to some products. on the forum they suggested to fasten the filter "Price from" with a list of values ​​"Yes" and "No". It defaults to "No". And I wanted to prescribe the condition that if this filter is set to "Yes", then display the prefix "from" before the price. The filter was screwed and lost in the Bitrix file system without finding the file that is responsible for displaying the price. The template was found, but the html file was not. We need a person who will explain what, how and why it works in Bitrix.