I lofted two cones using the same circle at one end and two different points at the other. I need to merge the bottom portion and remove the overlapping faces, is there a way to do this?
<sigh> When describing a problem it is usually helpful to relay ALL the relevant details. Solids & Surfaces use different tools. Try the Trim tool in the Surfaces toolbar.
If that's not what you need, and to prevent this turning into a "20 Questions" game, please upload the file or at least an image showing what you want to do.