John, I think that the Copy process is the safest. No matter what you do, you will still have to manually delete the second data set. The Merge process does not do that, contrary to what one might expect. Sorry about the wrong URL for my article - that was a copy and paste mistake on my part. Terry > On 11/24/2017 6:12 PM, Terry Reigel wrote: >> >> There is a detailed article about merging data sets on my website, at >> http://tmg.reigelridge.com/tmg/merging.htm#datasets >> >> Your other option is to Copy or Move everyone to the main data set, >> then delete the second data set. That is described in my article at >> http://tmg.reigelridge.com/copy-move.htm >> >> Terry Reigel >> The TMG archive is found here: >> http://archiver.rootsweb.ancestry.com/th/index/TMG/ >> Instructions on how to subscribe to TMG: >> http://lists.rootsweb.ancestry.com/index/other/Software/TMG.html >> ------------------------------- >> To unsubscribe from the list, please send an email to >> [email protected] with the word 'unsubscribe' without the >> quotes in the subject and the body of the message > > Thanks Lee and Terry. I haven't tried either approach just yet but  > both merge or copy appear straightforward.  Is one to be preferred > over the other? > > Terry the link http://tmg.reigelridge.com/tmg/merging.htm#datasets > doesn't work but, I found the info about merging at > http://tmg.reigelridge.com/tmg/merging.htm. > > John Wood > >