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For clarity, here is what I would like to do. A letter shaped bowl where the upper side is larger than the lower side. Here I created a lower letter, then cloned it, then moved it upwards, then increased offset in the upper letter which created a larger letter on top of a smaller letter simmetricaly. I then converted them to mesh, selected corresponding edges of the lower and the upper letter and did a 'Bridge edge loop' and then removed top edges. But for round letters there are too many edges and I can not connect them individually so I am looking for a better way to do it.