When you merge two or more features, the resulting feature property values are determined by the rules specified in the Split and Merge Rules dialog box. To ignore rules specified in this dialog box, turn on Ignore Split and Merge rules (see To turn on or off Ignore Split and Merge Rules).
Parcels x1-x4 have been merged to create new parcel X.
You can merge two or more features of the same class into one feature. You can also merge features with drawing objects. You can specify a new or existing feature ID for the resulting feature.