so before I begin I want to make it clear that while this is NOT a request for any particular retraining .. but more about procedure and clarification on how to do it - I have also asked this question in the past but to no answer
Mike Brock Responded to a thread here
again ... this is NOT questioning this decision and I would have responded there but it seems that the thread was locked before I got to it (at least it seems locked since I cannot respond)
You can retrain rogue into unchained rogue or vice versa. You can not retrain ninja into unchained rogue unless you want to use the retraining rules already established.
cool thats the Ruling .. the last part tho makes me ask the question ------ how is this done
the retraining Rules State - Quoted from SRD due to ease of text copy / paste
One of the most critical choices you can make about your character is what class to choose when you gain a level.
In general, it takes 7 days to retrain one level in a class into one level in another class. Some classes are more suited for this kind of retraining, as they have a similar focus or purpose—this is called retraining synergy. If your old class has retraining synergy with your new class, retraining that class level takes only 5 days instead of 7 days. Determine class retraining synergies according to Table 3 –8: Retraining Synergies.
Most prestige classes have retraining synergy with base classes that share their common class features. For example, the arcane trickster prestige class requires and advances arcane spellcasting, so it has retraining synergy with all arcane spellcasting classes. It also requires and advances sneak attack, so it has retraining synergy with classes that grant sneak attack. The GM is the final arbiter of whether or not a prestige class has retraining synergy with a base class, but should err on the side of generosity—if you would rather spend time retraining levels over and over again instead of adventuring, that is your choice.
now when you get deeper into this you have to take a look at how Alternate Classes are worded
Alternate classes are standalone classes whose basic ideas are very close to established base classes, yet whose required alterations would be too expansive for an archetype. An alternate class operates exactly as a base class, save that a character who takes a level in an alternate class can never take a level in its associated class—a samurai cannot also be a cavalier, and vice versa.
as far as I can tell Class retraining is done 1 at a time not in bulk and also from Highest level to lowest so the question of procedure becomes important
so a Ninja 6 Wanting to retrain into Rogue would have to go by Steps (theoretically)
so the particular questions are
A) is Retraining done in Bulk Rather than 1 Item at a time
B) does Ninja Consider to have Synergy with Rogue
C) do we treat this as a Class or an Archtype
there are probably another few that I could tack onto this but they arent coming to mind