For our retail store layout, we created a dropdown to allow the user to select an existing item of clothing, although we were hoping to filter this further by the category that the user selected (i.e.; kids, outerwear, women, males, shoes) so that they would not have to scroll through everything to find what they need. For example, the user would enter kids wear, and then the dropdown would solely have clothing related to kidswear.

 

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You might consider using a pick list in a popover portal, or a list in a card window. In some ways that can be less overhead than a conditional value list, but if that's what you're set on here you go:

https://support.claris.com/s/article/Creating-conditional-Value-Lists-1503692929150?language=en_US