Split and Trim give you precise control over polygon boundaries — useful when site conditions change or your initial geometry needs to be broken apart.
Split
Split is useful when a single polygon needs to become two pieces — for example, when a site is subdivided or split across ownership boundaries.
Select the polygon
Use x or select Split from More Tools/Command Line.
Draw a line through the polygon
Double click to end the command
Trim
Trim is useful when you need to cut away part of a geometry, such as removing an area that falls outside a boundary or trimming back an oversized polygon.
Draw a line intersecting a geometry.
Select the line.
Select Trim from More Tools/Command Line.
Click on the portion of the geometry you want to remove.
