I work on a draughtsman’s board at a nearly vertical angle. I have made a tray out of thick paper and taped it to the bottom of the board to catch pastel dust. I periodically vacuum this out. My father-in-law made a small table on castors which I keep on my left. This holds the pastels I am currently working with; and my calculator, ruler and colour charts.
The table on my right holds all of my pastels (which are kept in drawers in colour-coded order), and my pastel pencils.