If you're talking about placing a line w/an arrow on it in a drawing, try the following:

1) Select the Multi-Jog tool.
2) Pick a start point as you normally would.
3) Double-click at the end position you want.
(You can also right-click and select "End Leader".)

You should have a line with an arrow on both ends. Place your cursor over the end you don't want an arrow, right-click over the arrow and select the plain line at the bottom of the pop-up.