Scheduling of plans with Multiple Item

Dear Experts,

I am facing an issue, I had created Plans with Multiple, items each item is having different task list following is the example of packages assign.

                    6m     1yr     2yr     5yr

Item A             X               X    

Item B             X      X       X    

Item C            X       X       

So if I am scheduling  for Start in Cycle for 1 year its Creating Work order for Item B and Item C.

So my Question is It Should Generate Work Order for Item A after 1 year as its 6 Month is due.

Same if I am scheduling  for Start in Cycle for 2 year its Creating Work order for Item A and Item B.

So my Question is It Should Generate Work Order for Item C after 2 years its 1 year is due.

So I considered that Plans is not Considering Individual Item and as per higher hierarchy in strategy. In this case to get a correct result I changed my Task list for above as

                    6m     1yr     2yr     5yr

Item A             X      X        X    

Item B             X      X        X    

Item C             X       X        X

Is it correct method or there is another way to handle this scenario.

Thanks & Regards

Kamlesh