How to make it so that when filling out additional. section properties, were the properties of the same name filled in subsections and their elements?

Question

1C-Bitrix

If there is such an opportunity in bitrix at all?
If not, how can this issue be resolved differently.

Answer 1

Use the OnAfterIBlockSectionUpdate event handler.
Get the value of the custom field, get the list of child sections, and set the value you need for each custom field of the child section. Do the same with child elements.
Details: https://dev.1c-bitrix.ru/api_help/iblock/events/on...