FUSION - Inserting template tasks below a specific task ID in a project

and just to add ... where we have task templates that contain folder names identical to folders already on the project (we use MASTERS in every task for all deliverable assets)

when that task template gets added using FUSION (as above) - the project/documents then shows dupplicate folders called 'MASTERS'

I assume it needs some sort of 'linking' of the new MASTERS folder on the added task to the project document folder list ???

I'm reading this as you want them to be added as children to 234:ID, in which case the task ID of the task that you want to put them under should go in parentTaskID, not predecessorTaskID. 

@geraintjo seems like there's no provision to identify "the task under which to add the tasks in the template".

So 2 (more messy) options

1. Based on @chrisstephens' suggestion, you could try changing the indent attribute of the tasks you added
   • only modify the indent of tasks whose indent is that of the parent, minus 1. (You don't want to modify nested tasks)
2. If the parent already has children, you could INSERT a dummy task, un-indent the added tasks, then remove the dummy task
3. I don't know what that template looks like but you change the POSITION of a task by modifying its taskNumber attribute. So after getting the taskNumber of the task under which to insert the template you can insert the template to the bottom, then iterate through the just-added tasks and "move" them buy setting their task number

So we CAN do what you want but you need to be careful that these gymnastics don't muck up the original task relations. 

Lastly - this seems like a really meaningful usecase; might be worth adding it to the Ideas section!