sorting tasks

Hi

I'm using planner-multi and I'd like to have the following sorting on my
day planner pages :

I have 2 planner pages which hold very specific tasks.
The tasks on this 2 pages also appear on other planner-pages and also on
day-pages.
Now I'd like to sort the tasks on the other pages by these 2 specific
planner pages.

Example

Task1 is on SpecificPage1 and on Project1
Task2 is on SpecificPage2 and on Project1
Task3 is on SpecificPage1 and on Project2
Task4 is on SpecificPage2 and on Project2
Task5 is on Project1
Task6 is on Project2

This is what I'd like to have for the *Tasks* part :

*subtasks SpecificPage1*
Task1
Task3

*subtasks SpecificPage2*
Task2
Task4

*other tasks*
Task5
Task6


Any idea how I can achieve this ?
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