"Lock/Mark" warehouse objects

In my warehouses there are two main types of products.

The first are over produced items, which mostly get sold on the market.

The second are products that I need to store to fill production or sales needs when upgrading buildings. or products that i cant produce and need to buy on the market.

What I'd like is some "lock" icon, so I can differentiate between products I want to keep, and overproduced items I want to sell. Just to make it a bit easier when looking at the warehouse. so i dont sell something I need.

I understand about using the production log, but i have to keep switching between the 2 pages. Also as my memory is so bad and I have loads of products in the warehouse it takes time to do it.
As I'm newish to the game my over/under production is fluctating quite a bit as I increase my building and product range. So what I need to keep and sell varies. But there are a few products that are stable. I think it would just be easier to lock these products so i cant sell them.
But then again im just being lazy

By the way stdok, you rock!!