To add a regular maintenance task to Orchestrate it will help if, firstly, a Task type is set up, but this is not strictly necessary
Go to Planning > Task Types
Click on Edit
Click on New Row
In the Code section, put a relevant code, such as MAINT
In the description, put a useful way of describing the task, such as Regular maintenance
Give it a specific fill colour, if required.
How to add a task to the plan
To add a task to the plan, follow the steps below:
Right-click on the Gantt chart where you want it to be
Choose Insert Task.
Add the details by double-clicking on the task
In the Schedule tab, set the relevant times for the task, such as the Work Duration and the specific Start time, to make it the exact time required.
In the Detail section, the Task Type can be chosen from the dropdown, and any that you have created before will be available to choose from.
To make it a regularly repeating task, right-click on the task
Choose Duplicate Selected Tasks… and in there choose Offset Date / Time.
It is then possible to set the No. of Copies and the Offset which can be used to change the time to be every 'Hour', 'Day', 'Week', 'Month', 'Quarter' or 'Year' or any quantity of these, such as every 2 weeks, every 4 months or every quarter.
That will put the task at those points in the future.