Online shopping is one of the great conveniences of this age, and anything you can do to make purchasing easier is appreciated by your customers and likely to bring in more revenue through your store. An easy way to enable more sales is allowing customers to add multiple products to the cart, without having to leave their current page.
Offering this functionality is as simple as installing the WooCom Add Multiple Products plugin and using the newly added widget.
In addition, you can use this shortcode to add the input form to other pages:
From there, you can then choose which individual products this ability applies to via your settings page.