well, if the macro's are working poperly, and forgive me for not checking to see if they are back and working with the new merchant window, all you have to do is make sure you are standing in front of the correct starting npc, start macro, walk away......
Look into the top part of the macro and it will usually always tell you which npc to stand in front of and in what zone. Most of them are for Abysmal, but occasionly other zones as well. If the macro is made correctly, it will buy items, go to the forge, kiln, etc...., do the combines till out of ingredients, go back to vendor and sell the items back, rinse and repeat.