If you have the budget for it http://www.i-cubed.com/product-lifecycle-management/products-2/i-cubed-legend-10/
If you have a VAR or PTC contact there might be a non released tool for bulk loading to PDMLink.
Obtain Control with I-Cubed Legend 10™
I-Cubed’s Legend 10 is a multi-CAD bulk loading utility optimized for PTC® Windchill®10. Using it during CAD migrations allows us to validate data quality and usability prior to loading into the target system, improving the data cleansing process and rendering the migration more predictable and efficient. Legend 10 also provides control over the level of data migrated, so that you can choose whether to load the full history of your CAD objects, the latest revisions only, or other options. View the solution overview or contact us for more information.