How To Redirect To Other Way On A Select Onchange Event?

I'm trying to make a product browser selection interface that when I click the selection of productType in the column1, the column2 will appear the product with the selected produc

Solution 1:

What if you just outputted all the Products in a single select when you load the page and hide all the options by default then you can unhide the correct ones when you select a Product Line from column1.

A second option is to put multiple selects on the page when load, one for each Product Line and then hide all those selects by default and show/hide them as the appropriate column1 is selected.