To add a planner booking to the planner, you must firstly select a key to represent the booking. Do this by single clicking on the relevant key in the Key Window. Next create the booking in the Planner window by pressing the left mouse button when the cursor is over the required starting date. While keeping the left mouse button pressed, drag the cursor over to the required end date. Finally release the left mouse button. The booking will be added to the Planner Window.
Note: To add a booking to the Planner window you must have at least create access to the selected planner.