1C exchange how to add products to several Bitrix sections?

Question

1C

If you add a new section and add a product there that exists in other sections, then when you update, there will be just an empty section, and if you create a section on the site and duplicate the products, then when you update, because of this checkbox, I think the section itself and the products in it flies. Maybe somehow you can solve the seemingly simple issue with the duplication of goods in two sections. I will be glad for any help.