Go to the Calendar and click on any Officer Shift for which you want to generate a new shift. However, you can create a new shift for any officer from this.
Open any officer shift and hit edit from it, then you will see Create new shift button on the form.
Click on Create new Shift, you will see Officer name dropdown(required), Start date of shift(required), End date of shift (required) officer shift you wish to create(required), and you can add comment for this shift (if you want not required).
Once you fill in that information on this form it will save the shift and get the shift ready for that selected officer.