Clicking the Zoning button in the Parts panel displays the following dialog in the lower region of the panel :

This dialog lets you define the zoning (grid coordinates) for the selected Part.
For 2D and 3D unstructured Parts the geometry and meshing cannot be defined. The only option for unstructured Parts is the Transformation option, like translation, rotation or scaling.
- Plot zoning
 Standard plotting will only show elements that contain material, not unused elements.
Checking this box shows all elements, including unused elements.
- Zoning for IJK range
 These fields let you specify the IJK range you want zoning operations to act on. The default values are for the entire Part.
- Predef Geometries
 - Box
 Zone a box.
- Cylinder
 Zone a cylinder.
- Sphere
 Zone a sphere.
- Ogive
 Zone an ogive.
- Frag/Bric
 Zone a fragment / brick wall.
- Transition
 Zone a grid transition
- Import
 Import zoning from an external file (.zon)
- User
 Generate zoning from a user subroutine.
- Fill Block
 Zone and fill an Euler-FCT grid using data from an external file.
- Manual Zoning
 These options let you build a grid by specifying nodes and generating lines, surfaces and 3D volumes.
Click
  to reveal the following buttons : - Node
 Define the coordinates of a node.
- Line
 Generate coordinates along a line in index space.
- Surface
 Generate the coordinates of an index plane.
- Volume
 Define the coordinates within the current IJK Range.
- Transformations
 These options let you translate, rotate and scale your zoning.
Click
  to reveal the following buttons : - Translate
 Translate zoning.
- Rotate
 Rotate zoning.
- Scale
 Scale zoning.
- Operations
 These options let you perform various operations on your zoning.
Click
  to reveal the following buttons : - Copy
 Copy zoning from an existing Part to the current Part.
- Delete
 Delete zoning.
- Save
 Temporarily save your zoning.
- Restore
 Restore zoning you have temporarily saved.