Quick intro: Save your custom pieces for reuse and presets.
Step 1: Select a mesh (or multiple meshes if you want a merged asset).
Step 2: Click Save Mesh in the Construction panel.
Step 3: Enter Category and Type (Sub‑category) so assets are organized.
Step 4: Choose Save as Preset if you want it stored in the plugin Presets folder.
Result: Saved meshes appear under /Game/Construction/Saves/... and blueprints under /Game/Construction/Blueprints/...; presets appear under /Construction/Presets/....