[gradsusr] How to assign a 2-D array at many levels to a 3-D array

[jfj]

I am more familiar with fortran program than grads script. In Fortran, it is
very easy to assign a 2-D array at many levels to a 3-D array. For example, 
   Do k=1,10
      Do i=....
       Do j=....
          Arr3(i,j,k)=arr2(i,j)
       Enddo
      Enddo
    Enddo

However, in Grads, I don't know if there is a similar way to do so. "Define"
seems not work in this situation. Could anybody help me out on this issue?
Thank you very much.

jfj at ntnu.edu.tw