How to replace a block by placing a specific item in your GUI?

Hi, I'm a new MCreator user. I wanted to do something, but I don't know anything about procedures. I created two blocks, let's say they are Block 1 and Block 2. I also created an item, and a GUI with 1 slot for Block 1. I wish that when I put this item that I created in the Block 1 GUI slot, it turned into Block 2, and in Block 2 I could open the GUI and get this item back, then when I took this item out of the slot, Block 2 would go back to being Block 1. How? If you know and can help I appreciate it.