From: MB@nospam.net   
      
   On 11/04/2019 22:44, Keith Nuttle wrote:   
   >  From what I have read the only way to do this efficiently is to   
   > download both trees into your computer's genealogy software.  Once both   
   > are on your computer you can and merge Tree A into Tree B.  Once you are   
   > happy with Tree B,  you can sync it with Ancestry.  After while, Tree A   
   > from Ancestry.   
      
   I don't think everything from the online is downloaded when you save as   
   a GEDCOM (I think the only way you can download).  But I suppose you   
   could you through each person and import between trees afterwards to   
   make sure you have everything.   
      
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