Vertical and Horizontal Grids: The first two drop downs allow you to decide how the numbering system will work: Vertical Grids to be Numbers and Horizontal Grids to be Letters or vice versa. Changing one of these combo boxes will automatically change the other.
Sub Numbering: This will tell the app to use sub numbering when a grid indentation is found like such:
More Options: Here you can fine tune how the numbering should occur, you will be presented with a list of all grids contained in the project.
New: The new numbering for the grid
Previous: The previous numbering for the grid (before opening the dialog)
Orientation: The orientation for the grid is either horizontal or vertical and it is calculated automatically for helping the tool to renumber the grids.
Restore Orientation: Restores the orientation of all grids in the table.
Restore Order & Drag/Drop: You can drag and drop grids to reorder their position and then hit apply to commit the changes to the model, you can hit the Restore Order button to reset the changes.
Renumber List: Serves as a preview/ update on the table before committing the changes to the project.