I apologise if I have misunderstood the question, but:
1) You can increase the size of your recipe book, and;
2) You can increase the number of possible items for creation when you set up a dwarf crafting shop.
Both of these are done via skills acquisition and use of fishing proofs. Right now I have increased my crafting book to 80 recs and my dwarf creation shop offerings from 10 to 20 items.
I apologise if I have misunderstood the question, but:
1) You can increase the size of your recipe book, and;
2) You can increase the number of possible items for creation when you set up a dwarf crafting shop.
Both of these are done via skills acquisition and use of fishing proofs. Right now I have increased my crafting book to 80 recs and my dwarf creation shop offerings from 10 to 20 items.
Hope that helps.
Inch.
I don't think you were able to do the second. Everyone gets 20 dwarven craft slots.
I'm pretty sure (or at least pretty) you can't increase that number at this time.
Expand Dwarven Craft Recipe Book, Expand Common Craft Recipe Book, Expand Trade, Expand Inventory, Expand Storage are the only skill you can get with pocf