Hi @Sermae C. Platino ,
Sorry, I'm sure I misunderstood you earlier. According to your description, there is no way to achieve this in MS Lists. The field value of each column can only serve one item, and each field in the column is at the same level, which is by design. If you want to achieve summation, you can try to Export to Excel when the summation is required, and then perform the summation in the Excel file. Or try Power BI.
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