This add-on to Broadcast allows more complicated products and other WooCommerce features to be correctly broadcasted between blogs.
The basic Broadcast plugin supports WooCommerce product sharing just by adding the product custom type to the settings. That in itself should be enough to create a white label product list, but this add-on might offer some more broadcasting options that could be useful:
The add-on will automatically detect and modify [ add_to_cart ] shortcodes.
The add-on can copy the WooCommerce settings between blogs (see notes and screenshots below).
If you would like your PDF Vouchers to be automatically synced between all linked products, see the extras/woocommerce directory. Copy the sync plugin to your WordPress plugins directory and activate it network-wide. The reason the plugin is separate is because not everyone needs automatic syncing.