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Access the Targets page of the project you want to create custom reporting periods for. One way to access the page is to
Select My Apps from the top menu
Select Projects
You arrive on the My Projects page
Find the project that you want to set targets for
Select the More Options button for that project
Select Targets
You arrive on the project’s Targets page
There are two reporting options available at the top of the page
No deadlines (don't select this one)
Add deadlines (select this one)
A column appears asking you to Add A Date/Deadline.
Add the end date of your first reporting period
Keep pressing the Add A Deadline button until you have added all the dates you need for your custom reporting periods
Scroll to the bottom of the page and press save
That's it. You have successfully added custom reporting periods to your project.
You arrive on the Project page
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Add a custom Year Start Date for annual reporting periods (the default Year Start Date is 1st January)