How to model in RPD aggregate tables with different years of data

Can someone let me know how to accomplish the following in OBIEE?
I want to create a logical fact table with multiple logical table sources. I have an aggregate table that only stores current year data. In OBIEE, if a user builds a report using data from the current year, I want the query to hit this aggregate table. My base fact table however stores all years of data. If a user builds a report using data from prior time periods, I want the query to hit the base fact table.
And if you're curious, the aggregate only contains current year data because the ETL needs to do a full load each night due to the complexity. The high volume of data and the amount of time it takes to populate this aggregate means we only have time to populate the current year data.
Thanks in advance.

Yes this situation is both an aggregate table and fragmented data. I already modeled the aggregate table correctly specifying the content logical levels.
I'm not familiar with how to set the fragmentation logic. I see the fragmentation content section. What do I enter in this section to specify that my AGG table is for current year data? Do I need to enter something for both logica table sources?
Please let me know if there is a link with examples or an explanation. Appreciate the responses.

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How to model in RPD aggregate tables with different years of data

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