A short description can be entered for each plan. This makes it easier for you to identify the purpose or intention of each alternative you're investigating.
Click on the column heading of any plan, or just move to any cell in the GRP grid. Then, enter the description in this box at the top of the plansheet:
You can show plan descriptions for all plans in the main table view, by clicking on "Plans and desc", directly above the plans grid:
Notes Tab
Use the "Notes" tab to keep your own notes on the plansheet or its plans.