What are the options for setting up the unloading of goods from 1C to two sites?

Question

1C-Bitrix

The bottom line is that not all goods from 1C need to be uploaded to each site. Some products need to be uploaded only to the first site, some only to the second, and some to both the first and second. How can this be implemented? Do not offer selection by types of stock items and by groups of stock items.
Version 1C UT 11.2 (11.2.3.177). The exchange module is used by Bitrix.

Answer 1

Get Additional Props for the nomenclature and make a selection on it.