Bulk load/update billing extension

Just wondering, do we have an fbdi template/import management template that load/update billing extensions? as of the moment we use webservice but updating 100k records might take time so we want to explore other options if this could be done via fbdi or thru import management.

Navigation: Contract Management > Contracts > Billing > Billplan > Billing Extension

Target Field: "Percent" and "Calculation Level"