Hello,
I am currently modeling the object shown in Image 3. I am having difficulty creating the sharp transition at the intersection between the blue bottom surface and the wavy surface coming from the top. I cannot reproduce the crisp edge where these two parts meet. Could you help me understand how to achieve this?
Looks like someone sketched something implausible or not thought through. Two surfaces can only meet with a crease (“sharp edge between them”) if they meet at an angle. Ask the designer to furnish a proper sketch or ask what the formal aesthetic intention really is.
Did you tried trim and blendsrf?