I am expanding a state park that has recently added new property parcels. The new parcel is on the other side of a dirt road and the NJ Wiki suggests removing the roads because they needlessly complicate the map. (not necessarily something I agree with for several reasons, but I digress). Any, after importing new parcel, I am left with two non-overlapping polygons which I wish to connect together. How is best way to do this? I suppose I could expand the existing polygon, node by node, and “trace” over the new parcel, but is that the best way?
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If the existing state park polygon is a multipolygon relation: select the relation and the new parcel and Tools → Update multipolygon
If the existing state park polygon is a closed way: select it and the new parcel and Tools → Create Multipolygon
Could you link to the existing OSM feature so we could see exactly what is going on?
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It was right here, but my impatience got the best of me and I wound up doing the latter option that I mentioned. 
Still learning, but it looks like the existing polygon was an existing multipolygon, so I probably would have used the first method you had given me.
If not already known, acquaint yourself with the JOSM plugin utils2plugin and their brilliant functions of Shft+J, Shft+P and Alt+X (about latter I wrote an OP, having awesome ‘undocumented’ capabilities). Best practice for me is to avoid at all effort to create a multipolygon with a multipart outline. Keep it simple, KISS, your have 1899 nodes to max out on in a single line and the follow function traces existing outlines at 1000 nodes a minute. Hardly any reason at all to cut up MP outlines.
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