Navigate to pos.shoptiques.com/products
Click the Add Product button in the top right corner of the page.
Add your product as you normally would, filling out all required information.
You'll see next to the Add Product button a small drop down arrow. Click this arrow.
You will see the option to Save and Add Another.
When you select this, the product you were working on will be added and your screen will go back to a new Add Product screen.