Compounding

From Wonderland Online Wiki

Compounding allows players to combine multiple items together and create new items. The higher a players skill level in Primary Alchemy, the higher the chance for a higher level item to be compounded.

When compounding the item created will never have an Item Rank more than 4 over the lowest Item Rank in the compound.

This is the basic compound screen.

Clicking an item in your inventory will add it to the compounding formula. The first item you pick will be put in the large rectangle under the pot, and all the others will be put under it. The item in the large rectangle is usually considered the Main Component. However, if another component of the recipe is in a larger quantity, or is a higher level, it will be considered the Main Component whether it's in the large rectangle or the smaller ones.