Word that describes something as "built upon a foundation", but which doesn't imply that it's secondary, minor, or inferior

This is somewhat similar to this question, but a little different.

Essentially I'm trying to find a single term that describes something as being "built upon the foundation of something else", where that "something else" would be labeled foundational. However almost any word I can think of or can find on thesaurus.com has the baggage of also implying that the non-foundational item is somehow inferior, secondary, or minor.

In fact, in the situation where I'm wanting to use this word, the non-foundational items would, in some ways, be more central and important than the foundational items. (Of course, that said, without the foundational items, the non-foundational ones would not exist.) In my specific case, the non-foundational items are in some ways more the actual goal, focus, and object of the project, although it's a bit hard to say that either set is more or less important than the other set.

So what is a term that means "built upon a foundation", but that has zero baggage associated with it? In the question I linked to above, the same thing was being asked for a word that means "secondary", but in this case, neither set is secondary at all; they're both primary in their own ways.

One caveat though is that the term needs to be able to work well on its own, without being used as part of a larger grammatical construct. It should be easy to take this term and use it, by itself, as a label on a diagram. (This question came up because of a diagram.)

Perhaps the non-foundational item advances, enhances, or augments the foundational item that inspired it.