is it possibe to move a 30x30x30 area up by 50 blocks? (preferably in one procedure)

There are 2 ways of doing this:

1. I would recommend adding World Edit as an dependency and emulate some WE commands.

2. Painfully check every block and then painfully place every block checked.

Might be an other way (doubt it) but those are the only ones I know of though...

Here is a pseudo-code... Try translating this piece of code to MCreator's Procedure.    

for (int x = -15; x < 15; x++) // loops in the x axis
{
	for (int y = -15; y < 15; y++) // y axis loop (up & down)
	{
		for (int z = -15; z < 15; z++) // z axis loop
		{
			// Get block inside loop and place it 50 blocks up
			SetBlockAt(x, (y + 50), z, getBlockAt(x, y, z));
			
			// Sets old block at xyz inside loop to AIR
			SetBlockAt(x, y, z, AIR);
		}
	}
}