
Steve Geddes |

To use the rulebook subscription (which included the core rulebook and the bestiary as its first two items) as an example:
You can add this to your shopping cart.
When you go to check out, you can choose to start with the initial releases (which you've already got) or the upcoming Gamemastery Guide - which sounds like what you were looking for.
There are other subscription options too:
Here's the best place to start looking them over
If you bought books from other lines, the same process should be relatively straightforward - add the subscription and then choose the upcoming product as your first book.

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And if, say you've bought the Core Rulebook and not the Bestiary, you can start with both, and then contact Customer Services and ask them to cancel out the relevant item from your order.