Do you mean swap everything from top to bottom and vice versa ?  If so select everything on Top Layer and set it to Document layer, then set everything on bottom layer to top layer, then everything on document layer to bottom layer


@olamide2006, Do you mean that you are trying to transfer a signal from a track on one layer to a track on a different layer using a via or a multi-layer pad? The screenshot of your pdf does not give enough information. Please make your project public and post the link to it.