rickshaw

I have two files: one large master file with names and addresses (112,000 records) and a smaller file (450 records of a special interest subgroup created some time ago) with some of the names from the master file but out of date addresses. How do I get the new addresses into the smaller database? Basically I want to update my smaller data base with new addresses. The FMP manual is driving me crazy. Anybody willing to help a newbie?