Merging Polygons

Is it true that to merge 2 polygons together they need to be touching in some way???  If this is so, it is a major weakness for my application.  Farmers have irrigation sets that are hooked together in separate fields yards from each other.  Why can't we hook then together in Global Mapper.  If a farmer can do it, why can't GM???  In 20 year old MapInfo this can easily be done but apparently not in latest and greatest GM.  I hooked then together in MapInfo and imported them back to GM -- but, when I did the polygons were separated.   When looking at fertility and thermal data and then overlaying this data with irrigation sets to identify issues, it would be nice to see an entire irrigation set and not just pieces of a set. 
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