As you mention something around 1-5 policies with 10-50 items each, what about using some sort of accordion for your policies that you can use to show/hide the details in a sub-table (using a scroll bar for that sub-table to keep it short enough) for each policy?

Something like this:

^{download bmml source – Wireframes created with Balsamiq Mockups}

As you mention something around 1-5 policies with 10-50 items each, what about using some sort of accordion for your policies that you can use to show/hide the details in a sub-table for each policy?

Something like this:

^{download bmml source – Wireframes created with Balsamiq Mockups}

Edit: removed the scroll bars following Charles' advice