To Set Up a Traverse Plane
For Volume milling NC sequences, you can specify an intermediate retract plane, called the traverse plane.
1. While creating a Volume milling sequence, click Traverse Plane on the Volume Milling tab.
2. To change the reference plane, select the required plane from the model tree or the graphics window. The selected plane appears in the Reference collector.
3. To revert to the default reference plane, right-click the plane in the Reference collector and click Default Reference.
4. To remove the definition of the traverse plane when setting up a traverse plane for Volume Milling, or when setting up an operation level retract, select None in the Type box.
5. To copy the retract definition from another NC Sequence, select the NC Sequence from the model tree or by searching for features using the Search Tool dialog box that appears when you click > from the Creo Parametric main window. The retract definition is copied and from the selected sequence and its reference is highlighted in the graphics window and model tree.
6. Select or type the distance by which you want to offset the reference plane, in the Value box.
7. In the Value box, select or type the radius for the retract cylinder. The value can be:
◦ A number. For example 20.
OR
◦ A relation that can include other cutting and tool parameters. For example, STEP_DEPTH * 2.
OR
◦ A value or relation appears in the Value box if you have already defined the relation for the RETRACT_REF_OFFSET identifier. Define the relation in the Relations dialog box that you can open by clicking 
in the Edit Parameters dialog. For example, if you have specified RETRACT_REF_OFFSET = CLEAR_DIST in the Relations dialog box, the value CLEAR_DIST appears in the Value box.
in the Edit Parameters dialog. For example, if you have specified RETRACT_REF_OFFSET = CLEAR_DIST in the Relations dialog box, the value CLEAR_DIST appears in the Value box.Alternatively, click and drag the distance handle in the graphics window to create a traverse plane at the required distance. You can also double-click the distance handle in the graphics window to modify the value.
8. Click OK to set up the traverse plane.