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Firstly, what is a Civil 3D Parcel Union and Dissolve? Well, let's find out in this online training course. Certainly, this step by step tutorial is a part of the Civil 3D essentials book and how-to manuals.
When two adjacent parcels are too small or need to be combined for any reason, we can merge them. We can achieve that by either deleting the common lot line or using the parcel Union command from the Parcel Layout Tools. If for some reason, we changed our mind, we can easily Dissolve a parcel Union and separate them.