From Point snap
Use the From Point snap to set a temporary base point from which to offset point selection. The From Point snap can be used only while another active command is requesting a point.
To set a temporary offset point
1 Choose a command, for example, type line or move.
2 Do one of the following to choose From Point ():
On the ribbon, choose Draw > From Point (in Entity Snaps).
On the menu, choose Tools > Entity Snaps > From Point.
On the Entity Snaps toolbar, click the From Point tool.
Type from and then press Enter.
3 Select where to place the temporary base point.
4 Enter the offset distance from the base point, for example, (@8.5,0), where you want to locate the next point. Note that entering (8.5,0) places an absolute point from the UCS origin, not a relative point from the base point.
5 Continue with the original command.