To Simplify Hatching in a Complex Drawing by Defining a Boundary Set
When hatching a small area in a large, complex drawing, you can save time by selecting a smaller set of objects in the drawing to be used in determining the hatch boundary.
Click Home tabDraw panelHatch. Find
Expand the Boundaries panel, and click the Select New Boundary Set button at the bottom-left of the expanded panel.
Select the objects to be considered for the hatch and press Enter.
Selecting the objects with a crossing window is often the best method.
Specify a point inside each area that you want hatched.
Press Enter, or click Close on the ribbon to apply the hatch and exit the command.