How do I create cascading (dependent) dropdowns with numbers as the names?

I need to create cascading dropdowns, but there is a limitation to the excel function where the name must start with an underscore or letter. Here is an example of what I'm trying to do:

Product	01P230578	02P528931	03P209859
01P230578	20	1	50
02P528931	30	5	100
03P209859	50	10	200

When I choose the Product, it will only produce a list of numbers from that product.

I followed the instructions https://www.ablebits.com/office-addi...n-lists-excel/ , and was able to create dependent dropdowns with lettered names. But I cannot create them with names like "03P209859." Is there a way to create dependent dropdowns with numbers as the Names?

Use

=INDIRECT("_" & A2)

A2= "Product" data Validation List

Named ranges "_01P230578" etc