The UVW Mapping Clear modifier is added to an object's modifier stack when you clear a channel with the Channel Info utility. You can also add the modifier explicitly by choosing it from the Modifier List.
Modify panel > Modifier List > UVW Mapping ClearTo merge the results of the deletion into the object's geometry, collapse the modifier stack after deleting.
Specifies the map channel to clear. This is equivalent to clearing a specific channel in the Channel Info utility. If the specified map channel doesn't exist, the modifier has no effect.