Readjust a camera data set

I have a data set of size 2000*300*20. It is a data from a camera with 2000 pixel.

I want to extract out the last data set in the x and y cordinates i.e. at 300 and 20.

Afterwards, I want to use it to replace all the data points of all other x and y components.

I have made some attempts but with no success, I will attached my code for any for useful comments. Thanks

m=size(A.Volume); % A data of size; 2000*300*20
new_A.Volume=A.Volume;

for i = 1:m(2);
   for j = 1:m(3);        
       new_A.Volume(i, j)=A.Volume(:,m(2),m(3));
   end
end