Multiple column blocks select

Re Gutenberg editor.
I have 4 columns across the page, consisting of 2 blocks underneath each other within each column. The first block contains and image – the second a paragraph. I want to copy select all column/blocks – group and paste into new space below. Unfortunately holding the shift key does allow multiple block selection. Strangely I discovered that 2 blocks in single columns (one above each other) can be both selected using the shift key. I would be grateful for any advise on this please. Thank you.