InventoryBase: Choosing Base Trait under Compose New Trait is confusing to user.

[hkmanching]

Expected Behavior

As a user, I want to compose a new trait using variable + time. There are many options when selecting a trait that are not just variable, which makes it confusing and prone to error when selecting the base trait.

Currently, there are terms under the "Pick an existing trait" window for composing new traits that include all levels of ontology (Trait Class, Trait, Variable). Is it possible to only have the actual variable listed there to simplify options for composing traits? (reduce user error).

For Bugs:

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Environment

Steps to Reproduce