API Reference > imodeljs-common > Geometry > GeometryAppearanceProps > subCategory subCategory subCategory: undefined | Id64String Optional SubCategory id for subsequent geometry. Use to create a GeometryStream with geometry that is not on the default SubCategory for the element's Category or is has geometry on multiple subCategories. Defined in core/common/src/geometry/GeometryStream.ts Line 45 Last Updated: 13 June, 2024