Etsy doesn't have a way to bulk upload listings, but you can create one listing and copy it to save time.

Copying creates a brand new listing with all of the info from the copied listing in place. From there, you can tweak and publish.

If your shop isn't open to the public yet

Create your first listing, and then go to the Stock your shop step and click Copy below the item picture.

If your shop is open

To copy an active or sold-out listing:

1. Sign in to Etsy.com. 
2. Click Shop Manager.
3. Click Listings.
4. Find the listing. 
5. Select Copy from the gear menu.

To copy from one of your public listing pages:

1. Sign in to Etsy.com.
2. Find the Listing Tools links at the top of your public listing page. 
3. Click Copy. 

After clicking Copy from any of these methods, you'll be taken to what looks like the Edit mode for a listing. This is the copy of your listing and not the original.

Make changes as necessary and click Publish when you're done.

The new listing will have a new URL (web address), no views, and no admirers.