An architect or builder can clone a grid. 

You can clone a grid from within the grid library, by clicking the clone action button on the grid thumbnail - or - within a selected grid by clicking the clone action button on the grid action bar.

You can then select to clone “Just grid” (the grid framework with no constituent elements) or “Grid with elements” (the new grid will contain copies of all the original elements – with all element content effectively copied over also).

The cloned (copied) grid can then be found in your grid library.