On indexed or turn/mill parts you have two choices of the planes in which to recognize features:
Along the setup Z axis - the features will be recognized in the XY plane of the current setup axis.
Around index axis - To recognize features that require indexing, click the Around index axis radio button. You can then check the automatic checkbox if you want all of the holes around the axis to be recognized. If you want only holes at specific angles, then leave the automatic checkbox unchecked and enter the index angle. The index angle is relative to the setup axis, just as it is with any feature alignment. The actual angle that is output in the code is relative to the stock axis. If you want to graphically enter this angle, click on the Index angle hyperlink label in the dialog box and then click twice on the feature you are trying to recognize. Click once near the bottom of the feature and then at the top as shown below.
Feature recognition also works for holes that require a b-axis orientation. You can specify both the Index angle and B angle explicitly. A cross hole that is perpendicular to the index axis has a B angle of 90. If you specify the Index Angle with mouse clicks, the B Angle parameter is also calculated for that feature. If you click the Automatic checkbox, the index angle and B angle for each feature are calculated for all features around the index axis.