How to create a new property for an item?

Question

1C

Hello. You need to create the "Size" property in 1s and upload it to Bitrix. This property must be present in the group by item type . It turned out to create a property separately for each type of item, how to create a property immediately for a group of items?
Now in the exchange node, the size properties are displayed as different entities, and I assume that this is not correct or is it completely normal and will be uploaded to the site as one property?
Trade Management 11.2

Answer 1

immediately for a group of items?

only in appearance. there you indicate what additional props (property) will be common or separate for each nomenclature