Hierarchical Instanced Static Meshes Usage?

You’ll have to clarify the question further. You can manually place HISMs all you want in the Blueprint view-port. A HISM component has a single mesh object, any instances are copies on the GPU. Each instance can be moved individually, or as a whole by moving the blueprint object in your level. If you build something with those instances, you could export those to a mesh, then instance that mesh. This is general information that may not be applicable to what you’re asking, but I hope is useful. Here’s an introductory tutorial; UE4 Optimization: Instancing - YouTube