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To do this, open the Minecraft launcher, and select “New Profile” in the bottom-left corner to open the Profile Editor menu.  In the Profile Name box at the top, enter “snapshot,” and in the Version Selection section, check the first box labeled “Enable experimental development versions (‘snapshots’).” In the Use Version drop-down menu, select “Snapshot 14w28b,” and then click “Save profile” in the bottom-right corner. Just left-click the drop-down menu in the bottom-left corner of the launcher, and select the snapshot.  This should include coordinates for your character's current location as well as coordinates for the block they are looking at. <x1> <y1> <z1> This is the starting block that you wish to clone.  <x2> <y2> <z2> This is the ending block in an area that you want to clone. The area  connects the first coordinate and the second coordinate in a 3D block .  <x> <y> <z> This is the place where the cloned land will appear. The chat box allows you to insert various console commands in addition to talking to other players. Type it in to fill in each set of coordinates based on the ones you determined earlier. Do not include the angle brackets in your command, and make sure that they are separated by a space. The area will then appear at the <x> <y> <z> coordinate.

Summary:
Create a snapshot profile. Launch Minecraft using the snapshot profile. Open a new or pre-existing creative world. Press F3 to bring up an overlay of status information. Determine three sets of coordinates. Open the chat box by pressing T. Type in “/clone <x1> <y1> <z1> <x2> <y2> <z2> <x> <y> <z>” (without the quotation marks). Press Enter to clone the selected area.