Luckily this is really easy. Just open the svg, edit->select all (assuming you are using Inkscape) object–>group and name the resulting group either breadboard or schematic depending on which svg you are doing. The name needs to match what is in the fzp file but that is normally breadboard and schematic. If you are using an editor other than Inkscape, you just need to select the entire document then group it and change the group id.
Peter