Search bar/filter

Hi

So we have some costumers that mail us about our Search bar. They can choose filter In Stock and Out of stock.

The problem we have is that most of our products are pre-order with some a waiting time for a year. So its not really “in Stock”
But people just wana search for the products we have in the store. But when you choose In Stock all our pre-order also show up. Is there any way to add one more filter that just filter after In stock in the store?

You can probably make use of product tags to do that.
You tag the products with “Pre-Order” and the backend code need to be added, which when users click will only show those products in a given collection.
Let me know if you need help in implementation.