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How can i cast to desired blueprint?

I have made grid blueprint, construct event looks like this:
https://i.imgur.com/LrMcZo2.png
All it does is making a grid out of static meshes, grid itself: https://i.imgur.com/eDGYpsU.png

Now inside my gamemode i want to handle logic of spawning boxes on this grid, what should i use to make it work?
https://i.imgur.com/AISJJM8.png