Make a character into a digital asset
Select all character nodes in the network editor.
Press on empty space and choose Collapse, or press ⇧ Shift + C.
Press on the subnet node and choose Create Digital Asset.
Choose an internal name and human-readable label for the asset. Choose the library in which to save the asset (Save to library) and the scope in which to make the asset available (Install library to) See how to create a digital asset for information on these options.
Houdini automatically opens the type properties window for the asset.
Inside the asset, select all nodes except the character root node, and lock all Scale and Pivot parameters.
Turn off the Selectable flag on all non-control nodes (such as bones).
In the type properties window, turn on Hide default subnet parameters to hide the default transform tab for the asset.