Did you know that features can be transferred between the main spindle and sub spindle?
You are able to copy or move features between the main spindle and sub-spindle at will, using the new entries in the Features Window shortcut menu. You can use these to override the automatic spindle assignment, as determined by your 'Mill Features Spindle Assignment' settings, on creating the machining sequence.
For machines with both Main and Sub-spindles, features have “Copy to other spindle” and Move to other spindle” commands. Right click on a feature to either copy or move the features from one spindle to the other.