I am trying to figure out the new process of creating a family of symbols based on one starting symbol. In 5.x, this was done with the Alias tab in the library/symbol editor tools, but that tab is no longer present in 6.0. The Help documentation still refers to “alias” and the non-existent tab. Forum posts have mentioned a new “derived” status, to be created with “duplicate symbol” in the symbol editor, but my attempts at that always create a duplicate symbol rather than a derived one. The symbol library files use the term “extends”, and I can see clearly how to make “extended/derived/aliased” symbols with a text editor.
What is the official process of creating this kind of symbol using the Kicad tools?