Can I upload my listing to my company website before uploading it to 3rd party websites?

Can I upload my listing to my company website before uploading it to 3rd party websites?

Follow the instructions on How to Disable Automatic Update to Feeds/Portals and disable all website except your own. 

If you wish to send the listing to 3rd party websites at a later time.

1. Go into the Listing
   
2. Click on the websites tab and click on "+ Active" button for the appropriate website
3. Click "Update" button to send it to the websites for the first time