BFCxS‖

CY8pB‖Columns Before

C2DKF‖Insert a column before the column where the cursor is currently placed.

To access this command...

t8dFS‖From the context menu:

qBbLh‖From the tabbed interface:

sXy2C‖From toolbars:

LBCvF‖Icon Insert Columns Before

kN4MF‖Insert Columns Before