Oracle EBS 12.8: help to identify the correct APIs for creating Project Tasks and Subtasks

Hi all,

I need some help with the correct API for creating the parent tasks and subtasks for existing projects. These projects were created from PA forms thus have pm_project_reference field as NULL. As the users have maintain the projects by updating lots of tasks details and add new parent and subtasks at the start of the financial year, thus it is very cumbersome for them to maintain these long running projects from front end. Thus we are looking at the solution to have a custom WebADI foir the user which will be used to maintain existing tasks and create new tasks.