How do you include multiple splines on a landscape?

I am starting to use splines and wanted to create a river on my landscape. It seems straight forward and I added a spline to have the river conform to my landscape. The confusion I am having now is in adding a second spline on my landscape that is different than the river; specifically I wanted to add a riverbed to follow beneath the river.

This also got me thinking how would I add another spline for a path, or a road. It seems once you add one spline that is all you can do. Any additional splines just adopt everything from the original spline (mesh, material). If this can only be accomplished through the use of blueprints, I haven’t seen anything that explains the procedure. So far all tutorials I have fouind explain the creation of just one spline.

Any help would be appreciated :slight_smile: