You can add your exported compounds to an ICE tree in the same way as other nodes, for example by using the preset manager, using the Nodes menu, using Compounds Import Compound, or by dragging from a Softimage file browser or folder window.
In addition, you can apply a compound that contains an entire ICE tree directly to objects using the ApplyICEOp command, for example in VBScript:
ApplyICEOp "Roaring Fire.xsicompound", "grid"
This is how the Deform Footprints menu item has been implemented.
To create a compound that can be applied in this way:
Input ports with Picking string for operator defined in their port properties launch a picking session using the string as the prompt.
If Picking string for operator has not been defined for any input port, then a picking session is launched for every scene reference input.
You can add ICE compounds to menus using User Tools Add Operator to Menu. This automatically creates the command using ApplyICEOp for you. Choosing the operator from the menu applies the compound to the selected object.