[Koha] loading serial holdings

I loaded a number of marc records extracted from our ILS into a test koha system. The item creation from 952 tags seems to go pretty well. But I have not been able to find documentation on loading serial holding statements, whether summary holdings from say an 866 field or more detailed marc holdings from 853/863 tagging? Any pointers to how to configure an incoming marc record for this? Thanks, John Rutherford