SAS-VA 7.4 Aggregate items per quarter (12-month period) with different rules for each item.

[roberto_marques]

In SAS-VA 7.4 I need to add values of 12 months and present them by four months, but with some conditions:
1. I cannot use parameters, as the results must be calculated and presented every four months on all records in the database;
2. In a universe of several items, I must separate 2 items and add them, but each item has a different sum shape. Each quarter corresponds to the sum of 12 months.
Item 1
- 1st Quarter of the year considered (e.g. from 5/1/2018 to 4/30/2019): I must add only the values corresponding to the months of 2019;
- 2nd Quarter of the year considered (e.g. 9/1/2018 to 8/31/2019): I must add only the values corresponding to the months of the year 2019 (same rule as the 1st Quarter).
- 3rd Quarter of the year considered (e.g. 1/1/2019 to 12/31/2019): I must consider the value of January of the following year. In the example above, the value for the 3rd quarter will be January 2020.
Item 2
- For calculation in any quarter, we consider the sum of the values of each month - e.g.: 2nd Quarter of 2019: I must add the values from September 2018 to August 2019.

The value to be displayed will be the sum of items 1 and 2.

The sum of Item 1 I can do with the RelativePeriod or CumulativePeriod function, but the sum of item 2 I can't do.

Please ask anyone who can help me.

[roberto_marques]

Sorry, I made a mistake - my question is this: the sum of Item 2 I can do with the RelativePeriod or CumulativePeriod function, but the sum of item 1 I can't do.