How To Make Products Available For Syncing Between The Source And Destination Store?

To Make Products Available For Syncing Between The Source store and Destination Store: 

• Go to Products → Settings 
• under Settings section, you'll have three (3) options:
  - All Products 
  - Individual Product Selection 
  - Tag-based Selection 

• These options give you the flexibility to sync products between your Source Store and Destination Store. either you want to sync;
   - all active products available in your catalog 
   - only selected products 
   - tag-based selection (that means products based on specific tag). Also, you can choose weather you want to include or exclude tags. 
• click Save after selecting the option.