Well, you can create a product with two inventories in order to use it to clone it.
However, by using Export Pro it should work as well. I leave you this documentation where is it explained how to bulk import multi-inventories: https://forum.stockmanagementlabs.com/d/2036-how-to-bulk-import-multi-inventories
However, if you have any doubt please do not hesitate to explain them to us and we will help you.
Another option, is to use custom development to add two inventories to all your products by default automatically, but as we don't offer this service you will need to hire a developer.