Use the Chain Selection command in the Select by SmartSelect ribbon to select multiple elements that are endpoint-connected.
On the Draw toolbar, click SmartSelect .
On the SmartSelect ribbon, click Chain Selection .
Click to select a single element in the current drawing. Elements that are endpoint-connected to that selected element are also selected.
Filter settings determine the type(s) of elements that can be selected. Use the Locate Filter command in the SmartSelect ribbon to specify the type(s) of drawing elements to be selected.