Free item on purchase over a certain amount

-- HikaShop version -- : 2.6.2
-- Joomla version -- : 3.5.1

Hi,

Is it possible in hikashop to give away a free product on purchase of items over a certain amount. Like For every $1K products you buy, you get one free item. We need to make it so those items show up in their list of items in their cart just before they check out. The tricky part is the items need to vanish if they then lower their totals below the appropriate level.
Can i add an extra step at the end of the checkout process that would add any earned items to their shopping cart for free?

Maybe say something like “Now adding any additional free premium items you may have earned”, and the ask them to hit the “CONTINUE” button?

Any help would be greatly appreciated.

Thank you.