Your dealing with a very advanced area of Construct2 which is its picking system. I would recommend reading all the tutorials on families, picking of instances, and inventory systems (of which there are many):
https://www.scirra.com/tutorials/556/un ... o-families
No amount of instruction or free capx are going to be of much value to you if you don't develop at least the basic understanding if these key Construct2 workings/limitations.
Also, I believe you already asked this question once.. multiple threads on the same topic will only limit the amount of help people are willing to give.