How to add a subkey to the properties of elements?

Store-Directory-Partitions
Then I go to my folders, such as “furniture for the bath” and it has a child folder of the Mirror. And I need to set properties for mirrors, I have properties for all items, the properties for it in the section “Furniture for bathrooms”, but not for “Mirrors”, tell me how to add a section where I can set the properties of this subcategory
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March 25th 20 at 13:47
1 answer
March 25th 20 at 13:49
The division of properties into sections https://youtu.be/uV0f18dN0us?t=141

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