To maintain the "link" between your points and the model, use these SketchUp features:
To facilitate this link, several professional extensions and ecosystems are used: Making Control points in a model - SketchUp Forums
SketchUp’s Inference Engine is the primary way to "link" or snap to specific building points. When you move the cursor near geometry, the engine provides visual cues to help you align points accurately: Snaps to the start or end of a line. Midpoints (Cyan): Snaps to the exact center of an edge.