Objects in the same direction with the Join command are combined into a single object. The join command can be used for 2D and some 3D objects (such as walls, beams, curtains).
Join Command Location
You can access the merge command under the Modify title of the ribbon menu Drawings tab .
Click the Join icon in the ribbon menu .
Select the objects you want to combine. Click the right mouse button to finish the selection process.
The objects you selected will be combined.
Selecting the objects to be joined