Hello JP,
You can use the portfolio manager to view summaries, charts and reports of ALL portfolios. Although you can see the 5 funds in the summaries, reports and charts, you can't currently isolate them (you'll see all the other portfolios too).
There has been a long-standing item on AI's enhancements list to add functionality that supports multiple users (although I've since re-thought the naming and will change it from "users" to "accounts").
When that is added you will be able to create portfolios under different account names (e.g. IRA1 and IRA2). This will allow you to do exactly what you describe.
However there is no scheduled date on when this functionality will be available.