Extracting surfaces in Zbrush can be a great way to create new parts or add details to a model or sculpt. Extractions can be used for a variety of purposes, from clothing to various ornamental and decorative objects. Getting some nice, clean extractions can be a challenge depending on the shapes that you are creating.
Arrimus 3D walks through his process for creating ornamental details on a glass model, while noting best practices. It’s important to note that if you find Arrimus 3D’s tutorial useful, consider supporting his Patreon. Also visit his Youtube Channel for a wealth of other tutorials and tips.