The join tool combines multiple lines into one.
To use the join tool:
While holding SHIFT, click on lines needing to be joined into one.*
*Note: The line selected first will have the dominant attributes, meaning those fields will overwrite all other objects selected.
2. Right-Click on map. Context Menu will appear. Click "Join Features."
3. Green Notification "Features Joined Successfully" will flash. Objects are Joined. They are also saved.