You can use the Trim/Extend Wall command to join two walls whose extensions intersect with each other . Trim/Extend Wall command is only valid for walls. To run the command;
Click the Trim/Extend Wall icon in the ribbon menu .
Click the first wall.
Click the second wall.
The first wall will extend to the second wall and the program will join the walls.
If the walls you selected do not intersect, you will see the message Faulty Walls in the message box .