Whenever you have Feature Symmetry, you'll want to utilize Mirror Feature
Mirror requires a Face/Plane to Mirror About
Mirror should be towards the bottom of your Drawing Tree
You may Rollback before the Mirror, insert additional features, then Rollback after
In most cases, you can Mirror Features Individually
In some cases, you'll want to Mirror the Entire Body
Feature Symmetry is when it's easier to Mirror Features rather than add duplicate Entities/Relations/Dimensions and/or Sketch Mirror
Menu Bar→Insert→Pattern/Mirror→Mirror→LMB Plane→LMB Secondary Tree→LMB Features→Check-it-Out
Features Tab→Mirror→LMB Face→LMB Features→Check-it-Out
There are some Features that cannot be Mirrored due to their Conditions, in these cases Mirror Bodies may work best
In most cases, you'll want to Merge Bodies
Click the Model that exhibits Feature Symmetry (is a good candidate for Feature Mirror)