You want to update the Valuation Level Type of Materials in batch mode.
There is no place to maintain Valuation Level if you try to use Migration of Materials tool and Mass Data Maintenance tool to update the materials.
SAP Business ByDesign
This functionality cannot be achieved due to complexity.
Please manually update the valuation level of materials.
Material Valuation Level Type , KBA , LOD-LE-MIG-MWB , LEAP Migration workbench , How To