Options and Variances - Can you push the value of a Input Parameter to it's children?

Hi Community,

I’m currently experimenting with Options & Variants to see if it could fit our company’s workflow.
For testing, I’m using this setup: one Configuration End Item with a single Configuration Child underneath.

So far, I’ve been able to successfully propagate parameters that are linked to option choices down to the child Configurable Articles.

What I can’t figure out is how to propagate the value of a regular input parameter (for example, a length) from the parent configuration down to its configuration children.

The idea is that the top-level configuration would receive one input length, and multiple configurable children would each calculate their own required length based on that value.
I would then also like to use this new length in the Variant name.
However, I haven’t found a way to pass that parent input parameter to the children.

Has anyone done this before, or can explain the correct approach?

I'm using Windchill 12.1.2.4

Best regards
Justin