Hello,
01. When yo add bundle product the quantity indicator showing by default:
https://woocommerce.com/products/product-bundles/
02. Product functionality comes with WooCommerce plugin and its storage is not handled by the theme. Import/export options you can find in Dashboard -> Products.
But our customers usually use this plugin to import the data
http://www.wpallimport.com/
We suggest you contact plugin developers and ask your questions before the purchase.
Best Regards.