Before you can create an anchor plane, you must first have run a warp analysis. You need a result from the warp analysis from which to define an anchor plane.
An anchor plane is a reference plane against which to measure warpage.
Go to your warpage results in the Study Tasks pane, and select a warpage result.
Click (Results tab > Warpage panel > Visualize) to open the Warpage Visualization Tools dialog.
Select Anchors from the list of visible options.
If you do not know the identity of the nodes to create an anchor plane, click on your model and select three nodes to define your anchor plane. A visual representation of the three nodes will appear on your model as you select them.
If you know the identity of the nodes you would like to use to define the anchor plane, type them in to the Anchor nodes box, and click Apply after each entry. A visual representation of the three nodes will appear on your model as you select them.
Type a name in the Anchor name box for future reference.
Click Close when you have defined all three nodes.