The new “sum” grouping for sensors is incredibly handy! Unfortunately not everything should be added together for some groups. When dealing with power I have a couple of sensors that are power suppliers instead of consumers (think solar panels). To properly add these to a group I’d have to add an additional template sensor to get a negative value that I can add to a sum group.
A better way to go about this would be a small toggle next to each entity added to the helper to set it to “subtract” (or negative). This way each individual sensor can either be added or subtracted to the total.