How to upload only changes from 1C UT 10.3 to Bitrix?

Question

1C-Bitrix

There is an online store on 1C Bitrix, there is 1C UT 10.3. A complete upload from 1C to the site was made, then goods were added that are not in 1C, but will be on the site. When unloading from 1C, all goods are overwritten, but it is necessary that only changes go through.
What should be indicated in the "Exchange node with goods"?

It is necessary that uploading from 1C to the site does not overwrite the products that are in the catalog, but not in 1C, so that it only adds new products from 1C and updates the products.