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:
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