How do you link a "ledger set" to FSG report?

 We want FSG to aggregate multiple ledgers on one column for a balance sheet type report.  When I run a test FSG report, the column with the aggregated ledgers is zero. I found note #874343.1 which says that using "ledger sets" allows for aggregating data across multi ledgers.  I've created a "test" ledger set that has 2 ledgers.  How do I connect this to the FSG report???  Further digging says I have to define a "Definition Access Sets".  In the form to define the "Definition Access Sets", I don't see how to define the "Definition Name".  Would appreciate a reply from someone who has