66% means it's 66% possible that it is het for stripe, 66% chance het amel, 66% chance het hypo etc... 33% chance that it is not.
This is how the 66% comes about.
Lets say you breed a normal het amel x normal het amel (Aa x Aa)
This results in AA, Aa, Aa, aa.
So the offspring are 25% AA (normal), 50% Aa (normal het amel), and 25% aa (amel)
However, there is no way to visually tell the difference between AA and Aa. So when we look at the outcomes again (AA, Aa, Aa, aa), and remove the one we know for sure which are the amels we are left with (AA, Aa, Aa). So 2 out of 3 of the normal offspring will theoretically be het amel. 2/3=66% So all the normal offspring in this clutch have a 66% chance of being het amel, 33% chance of not.
Anery who is 66% het Stripe, Amel, Hypo & Caramel. So if I bred him to my female Normal Pinstripe het Hypo Caramel Stripe what would I get?
What you would get will end up depending on whether or not your anery is het stripe, amel, hypo, caramel...because there is a chance that it is not (and it's not an all or nothing thing, it could be het for a couple, and not het for the others, etc...)
Now, pinstripe is used so many different ways, do you know for sure what you are dealing with? When I think pinstripe I normally think of an animal that is genetically a motley (mm) but the pattern looks similar to a stripe. However, you also say that the 'pinstripe' is also "het stripe", for this to be possible it leads me to believe that what you have is a motley-stripe (ms), so that is how I will play this.
So what we know for sure is the anery x motley-stripe. This will result in 100% normals het anery and either het motley or stripe.
If your anery is het stripe, then you will also get some motley-stripes (ms) in the mix and some stripes (ss).
If your anery ends up being het hypo you should also get some hypo's in the mix because your motley-stripe is also het hypo.
If your anery ends up being het caramel then you should also get some caramels in the mix because your motley-stripe is also het caramel.
If your anery is het amel, then the offspring may or may not be het amel, but it is impossible to know if your anery is het amel without breeding it to another animal that is amel or het amel.