geozap, now you have me thinking. There are 3,700 parcels in the area. Are you suggesting there is a way to go from the legal description of the parcels (with lots and block numbers) to being able to select just the correctly numbered parcels from the master and creating a new layer with the parcels formed by a union into the correct shape and location??? An example of one of the more complicated parcels is AVALON C BLK 96 LT 6-10 21-24 0.465 ACRES. Removing the last two tokens leaves the pertinent information to form the parcel. Each parcel contains fields for the subdivision (Avalon C), block, and lot. I would think the dash notation, 6-10, would present a problem for automating directly, but I could probably come up with a way to expand that. Not sure of the syntax needed to make this work, though.
Art, not sure if you were replying to me, but I had not thought of convex hulls to redo these parcels. I tried two approaches to it. First I tried selecting the appropriate parcels from the master and using the Convex hull transform to create a new parcel in the correct layer. Starting with zero muscle/mousle memory I made a lot of mistakes the first few times. I found myself forgetting to select the new layer after selecting the parcels in the master layer. So I went with that approach and then copied all the new parcels into the working layer afterwards. What I did not care for was the creation of a point at every corner of every lot. The second approach was to create points snapped to the corners using the master lot layer to snap to. New points went into another layer. Then I collected the appropriate points and ran the Convex hull transform on the points. Then I moved the new parcels into the working parcel layer to renumber them. This alleviated the problem of extraneous points at the corners of the lots. Between the two approaches I like the second better. Between this and my old approach of moving/snapping all the points to the correct location I think I like Convex Hulls better. There was a lot of having to aim with the mouse in the old approach, and, as my eyes are aging, the Convex Hull transform seems to be moderately less hassle. My predecessors sometimes created multiple points at the corners which added a hassle factor to the old way. Now I can simply delete the old parcels and not deal with their quirks.
I wonder if Convex Hulls would help Ian with his issue? It's not automatic, but it might be better than manually moving all the points.