Click Browse to select the asset to copy failure modes to.

Current mapping only - the default selection limits the update to the current mapping
Descendants only - only descendants of the target asset are remapped
Current mapping and descendants - both the current mapping and the descendants’ mappings are update

If you select to update descendants, the Descendants to update options are available:
Only descendants that are currently “to be determined” - only descendants that have not been mapped are updated
All descendants - descendants that have been mapped are also updated