apm install select-rectangleor find it in the Packages tab under settings
At first, select region that you want to do.
Next, press alt-s to select rectangle region. if repeating the alt-s would go back to the initial selection.
After that, You can copy, cut or following actions.
After selecting rectangle region by alt-s, alt-cmd-c clears the region-rectangle by replacing all of its contents with spaces.
After selecting rectangle region by alt-s, alt-cmd-o inserts blank space to fill the space of the region-rectangle (open-rectangle). This pushes the previous contents of the region-rectangle to the right.
