Not following what you are asking to do. While using the Line tool, LightBurn will snap to a grid point or another node to help you “connect” things. You can also do this using the ‘Edit Nodes’ tool.
If by an image you mean a bitmap - like a picture, LightBurn does not provide tools for this as of yet. If you are talking about using vector-based art, you can use the Boolean or Cut Shapes (new feature in version 9.15) tools to edit your work.
Maybe you can share the source art and some details/illustrations to help us better understand what you are trying to accomplish and we can offer some suggested workflows.