There are various tricks that you can use to simulate scenes in Moho, but IMHO the approach that makes most sense is to use a video editor, like Alan suggests. Premiere, After Effects, Final Cut Pro...whatever.
J
You can't have everything. Where would you put it?
If you don't have any other software, In Moho put all elements of one scene in a group layer, do the same for the other scene, then you can render individual scenes by turning on or off the group layer you want (clicking the eye icon on the layer tab). HTH