Hallo,
Assuming you want magic success dust, /warp tinkerer (/tinker for short) takes only custom enchantment books, not items with custom enchantments on them. /warp blacksmith (/blacksmith for short) combines two custom enchantment books of the same type and level to make it one level higher, such as combining two Alpha VI (6) books would make one Alpha VII (7) book. You can also combine magic success dusts in the blacksmith, but it just wastes XP and more often than not gives you one magic success dust with a lower percentage. Hopefully this answers your question, have a great day!
In service and in friendship,
anaxrocks