Say you have have 3+ objects that are overlapping in some fashion in a scene. And maybe usually, the y sorting works great, but in one particular instance you want an object to be rendered above or below another interacting object and this would go against the traditional y sorting and you only want the sorting to interact differently with that object, with anything else it should still be the same. The docs for sorting group indicate that is what it is intended for but it seems to mess up sorting on y axis or changes where the y sort is being determined. For example. I have objects where the sort point is the pivot, not the center, but when I make it part of a sort group, it starts rendering over the top of objects on the same sort layer that have a lower y axis value for their sort order, that is was previously rendering behind before being added to the sorting group. So sorting group is not usable in this case.
make z always equal to your y
then sort by z
on occasions that you want other sorting rules, change the z to be different than y and manipulate the sort order
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Thank you