IntelliJ IDEA supports the column selection mode which can be handy while working with Markdown tables.
Use column selection to manage tables
Enable the column selection mode: press Alt+Shift+Insert or select.
Select the whole column using a cursor or select one cell and then use Shift+Up and Shift+Down to select others.
Copy the selection.
Step to the end of the first row and paste.
Now you have a copy of the table column and can edit its content. In the same way, you can delete the column.
Use multiple carets with column selection
Step on the row.
Use Shift+Up and Shift+Down or drag the cursor and move it up and down to place carets to each row.
Edit a few values.
Switch the column selection off or reload the tab.