Expiration date

I already have an app that has three views, I have an issue with one of them. It is an inventory app, and I want to classify them by expiration dates. If you can see, it is the same item but the app doesn´t add up both of the values and make them a single one. For example, I want it to appear as 28 not both rows. How can I do that??
Captura de pantalla 2021-07-12 155842

I recommend you review the existing inventory management sample apps here:

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I don´t know how to add them by group and by date. I imagine there must be a formula, but I´ve tried several ones and the program doesn´t do what I want