Mining Question

Hi, I and my team are making a small LEGO type game, and I have been curious how to import Mining items, could you help me?

Since you say “Mining Items” which is behavior, I suspect you mean that.
In that case, you can not import it, you need to program it. Try C# googling around for 3-dimensional arrays or spatial hashing. And remember to not use inheritance to reuse code, make reusable components instead. Also, don’t underestimate the power of prefabs, they do wonders.