Lets you edit the animation of an object placed in the scene using the Object Placement Style Editor.
Specifically, you can use this panel to:
Open this panel from the Position Controller rollout by clicking the "E" (Edit Animation) button adjacent to any of the following placement parameters:

The Placed Object Animation Editor is a greatly simplified version of the standard 3ds Max Track View window. It is configured specifically to display only placement information relating to the currently selected object. When the current object selection changes, this panel closes automatically.
The Placed Object Animation Editor displays motion as a series of function curves on a graph. Motion in 3ds Max is defined by a series of animation keys, and 3ds Max automatically calculates interpolated values between each key to produce a completed animation.
The Placed Object Animation Editor interface consists of toolbars and a Key window. There is also a moveable time ruler.

Each function curve displayed in this window represents the interpolated animation assigned to one of the four standard Civil View object-placement parameters:
Each square box along a curve represents a single animation key. You can moved, add, and remove keys, or adjust their tangents. Each modification to an animation key instantly affects the overall animation of the selected object.
Keys are displayed in gray unless you select them for editing. In this case, they are displayed in white.
The vertical axis of the graph represents one or more of the following parameters, depending on which function curves are currently displayed:
The horizontal scale represents the total number of frames available in the current visualization scene.
[show hierarchy]Click this arrow button to display the Track View Hierarchy.
While the hierarchy is displayed, you can hide it again by clicking
.

Click to open a dialog that lets you choose what to display in the Key window. See Filters Dialog (Track View).
Move Keys Moves keys freely both horizontally and vertically.
Move Keys Horizontal Moves keys only horizontally.
Move Keys Vertical Moves keys only vertically.
Slide KeysClick to move keys horizontally and slide adjacent keys away.
Scale KeysClick to compress or expand the amount of time between selected keys.
Scale ValuesClick to increase or decrease the value of the selected keys.
Add KeysClick to add keys to existing curves.
Draw CurvesClick to draw a new curve or revise an existing one by sketching directly on the key graph.
Simplify CurveClick to simplify a curve by reducing the number of keys on it.

Set Tangents to AutoSets highlighted keys to automatic tangents, as calculated by the shape of the curve around the key.
Moving the handles of an Auto tangent changes the tangent type to Spline, and makes them available for editing.
Set Tangents to SplineSets highlighted keys to spline tangents. With spline tangents, you can adjust the slope by moving the key handles. To break continuity between the incoming and outgoing tangents, hold down Shift while moving the handles.
Set Tangents to FastSets highlighted key tangents to fast in, fast out.
Set Tangents to SlowSets highighted key tangents to slow in, slow out.
Set Tangents to SteppedSets highlighted key tangents to step in, step out.
Use step to freeze motion from one key to the next.
Set Tangents to LinearSets highlighted key tangents to linear in, linear out.
Set Tangents to SmoothSets highlighted key tangents to smooth.
Use smooth tangents to even up discontinuous motion.

Lock SelectionLocks the current key selection. Once you have created a selection, turn this on to prevent something else from being inadvertently selected.
Snap FramesRestricts key movement to frames. Keys that are moved will always snap to frames when this is on. When this is off, you can move a key so it falls between frames and becomes a sub-frame key.
Parameter Curve Out-of-Range TypesUse this to repeat keyframed motion beyond the range of the keys. Includes options for Loop, Ping Pong, Cycle, or Repeat relatively, as well as constant and linear. If you use Parameter Out-of-Range types, you can later create keys using Track View > Utilities > Create Out-of-Range Keys. See Parameter Curve Out-of-Range Types.
Show Keyable IconsDisplays an icon that defines a track as keyable or not.
View All TangentsHides or displays all tangent handles on the curves. Use this to hide the handles quickly when many keys are selected.
Show TangentsHides or displays tangent handles on the curves. Use this to hide the handles on individual curves.
Lock TangentsLocks the selection of multiple tangent handles, so you can then manipulate several handles at once. When Lock Tangents is off, you can manipulate only one key tangency at a time.

When you select a single animation key, you can use this toolbar to accurately manipulate the position of the selected key by typing in new values here.
Shows the frame number of the selected key. You can edit this value.
Shows the value of the selected key. You can edit this value.
Show Selected Key StatsWhen on, the Key window displays detailed statistics for the selected key.

PanPans the Key window.
See Pan (Track View).
Frame Horizontal ExtentsAdjust the Key window so all the active time segment is visible.
Frame Value ExtentsAdjusts the Key window so the full height of curves is visible.
See Frame Value Extents.
ZoomZooms the Key window.
See Zoom Track View Key Window.
Zoom RegionZooms to a rectangular area of the Key window.
Isolate CurveTemporarily isolates a single curve.
See Isolate Curve.