AbleCommerce Shopping Cart Software

In our OOB installation, I don't see where you can check to ship to multiple shipping addresses. Do you have to do something to enable this?

You should have at least two products in your basket and then try checkout. On checkout page where you provide address information you will see Multiple Destinations? section in sidebar click the Multiple Destinations button.

You may need to go to the Manage Content and Layout (Scriptlets) page, then "Checkout Page Content A single page checkout for both registered and anonymous users "

and set it to true

There is also a property in the ConLib IIRC to enable multiple ship to addresses.

I suggest going to your Admin area, ConLib reference and PRINT the SHOW ALL content and reference it during your store design.