Question about Selection Objects

Development Programming & Scripting Blueprint
1

Hi,

This is My first post and I need help with a small project that i do.
I trying to Create Selection Static Actor System like old game Theme Hospital:
Theme Hospital - Building the Best Hospital EVER! - Ft. FizzleNinja! - YouTube (First Stage Building a room (blue background)) i creating RTS system Selection, but this is not good it is not precocious.

I think i need get coordinates from first Actor i click and then get proper draw position, anyone can tell with function i need to use to achieve it?
pic below

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2

You need a raycast for the selection and Mouse Screen Position for UI draw.
https://docs.unrealengine.com/latest/INT/Gameplay/HowTo/UseRaycasts/Blueprints/