The Merge button will combine overlapped objects into a single object in Trace.
Select the desired objects.
Click the Merge button.
If the objects do not merge as expected, click Undo and move the objects into a more desirable location or edit the object shapes and try again.
Auto Join Segments: Trace
Auto Join Segments Button: Trace
Break: Edit Section: Trace
Break and Join Segments: Trace
Breaking an Object in a Specific Spot: Trace
Join: Edit Section: Trace
Manually Join Segments: Trace
Merge: Edit Section: Trace