About Joining Segments
Use the Join tool to connect two intersecting board segments. You can trim the nonintersecting portions of the segments, add a bend and bend relief at the intersection, as well as flip the orientation of the intersecting segments. Keep in mind the following points when joining segments:
The intersecting segments must be planar.
The driving and offset sides of the segments to join are swapped automatically, if necessary, to match the sides of the earliest segments created.
Swapping the driving and offset sides can change the location of cuts located on the segments. For example, when you reorder a Join feature in the Model Tree and reinsert it before a cut that references an automatically swapped side, the location and the geometry of the removed material may change.