INSERT INTO catalog_product_entity_group_price(
    entity_id,
    value,
    customer_group_id,
    all_groups, website_id)

  SELECT entity_id,
     value + (value/10) as value,
     2 as customer_group_id,
     0 as all_groups,
     0 as website_id

  FROM catalog_product_entity_decimal

  WHERE entity_type_id=10
     AND attribute_id=100
     AND value IS NOT NULL