I built a Total Revenue Cube but there are four different reports that I want
to pull against this cube. So I thought I should build 4 partitions to
reference the different filters for each report.

Any suggestions?

4 reports doesn't correlate to 4 partitions.

4 partitions could correlate to 4 sources; or Sales_2005, Sales_2006,
Returns_2005, Returns_2006

then most likely; when you build a report; you will report off of all 4
partitions.

it's super-fast give it a try!