Hi,
several options available to map your slot index with a vector3 position.
-- If you are using PlayMaker 1.8 you can create a an FsmArray with all the vector3 position, and you use the index of the array to get to a specific Vector3. Simple and effective
-- If you are not using PlayMaker 1.8, use
ArrayMaker. It's a fully feature system for working with lists and hashtables. so you'll have two ways, one using an ArrayList ( like an FsmArray basically), or using a hashtable, where the key will be your index, and the value will be your vector3 position.
-- maintain dummies that represent each slot position, and name them properly with a convention like "Slot x", so you would have "Slot 1", "Slot 12", and simply use the action "Find GameObject" to get a reference of that dummy, get it's position, or use it as a target for your tween directly. MAKE SURE you use a tag 8 for example "slot", and when using "Find GameObject", that you filter by tag, else it will impact performance, finding object in the hierarchy is not effective ( a Unity limitation), and using tag will improve greatly the search performances.
There are few more ways, but since you are starting with all this, those would be the main ones that you should each master and understand fully. Being able to use one of these solution will help you in the long run to create more and more complex features. The last one if the most direct one without having to learn too many new concepts ( list, arrayList, hashtable are advanced concepts, difficult to grasp if non coder).
let me know how it goes,
Bye,
Jean