https://bradfolio.com/downloads/zbrush-plugins/zbrush-plugin-texture-tools/

• Check out a cool Texture Tools ZBrush Plugin by Bradford Smith that can improve the workflow for creating Tiling Textures through the use of Subtools and Insert Mesh brushes.
• IMM split and selection shortcuts
• Auto-Tile shortcuts
• Subtool Duplication batch
• Support for Unified Space (default) and custom defined Tile Area (facing down Z-Axis only)