Using the Boundary Trim command, you can specify a closed boundary as a trimming edge for a selected set of objects. You can use this option to trim objects inside or outside a boundary. Use Boundary Trim to quickly clear a circular or rectilinear area in a complex map in order to insert a legend or label.
To trim objects inside a boundary
Open a drawing and attach the maps you want.
Define and execute a query to retrieve the objects to trim.
Under Objects To Trim, specify whether to select objects manually or automatically, and whether to use only objects on selected layers.
Under Trim Method, specify whether to trim inside or outside the boundary. Specify whether to exclude topology objects, and whether to retain object data on the objects.
Under Objects That Cannot Be Trimmed, specify what to do with text, hatch patterns, and blocks that cross the boundary.
Click OK.
To save the trim with your topology, save your changes back to the source drawings.
To save the trim results without modifying the original topology, save the changes to a new drawing.