How do you make another group of meshes? Well open up yeh FeralHeart and click Tools, go to the Object Maker. You see the box where you type next to "Group:"? Type in the desired name for it and click save, now if you click on it in the box that lists all the object groups and import your object it should save there when you hit the save button. Or before you hit the save button type in the EXACT name of the group.
How to import objects: Like I said on how to save an object in that group, in case you don't know how to fill out the other information I'll show you. On name type in what you want your mesh/object to be called. Now click on mesh at the top of the tab, in material enter the name of the object's material file and at the end put, ".material," Same with the mesh except you enter the name of the mesh and put, ".mesh," Then click add new. Then it should load.