I have two drop downs from a different table that I need the other cell populate its value based on the adjacent cell value selected

I have a main table with two specific data columns I load into two separate drop downs in another table. In the new table, picture selecting a value and wanting to populate the adjacent cell at the same time.

In other words, I have two populated drop-down cells in a new table based off of collected column data from the main table.

I need the new table to populate the (pin cavity) value column based on the selected (pin name) value column and vice versa.

I can get each column to correctly provide the data in each drop-down table cell but they work only independent to one another.

The attached image shows how I got the independent dropdowns populated. I need to have them work together when either drop-down selection is made.

This image is the main table where the drop-down are populated from.

Can someone please help me?

Thank you!

I'm new to Retool so I'm not sure.
I'm relying on data in the main table to populate the drop-downs of the I/O Function with another cell drop down populated with pin cavities (check).

I want to select either the I/O function value or pin cavity and auto populate the other based off of the accompany selection made.

I see ... in the example given and have no idea what that means (is code missing?).

I was hoping for a small, simple step by step example that could elaborate on (crawl before running if you will). I'm not a coding expert.

Can you or someone provide me something simple to work off of?