Update Multiple Records from Single Stateless Form Submission

Update Multiple Records from Single Stateless Form Submission

I have created a stateless form that has a multi select lookup field and a couple other fields.  I want the form to update all of the records selected in the multi select lookup field. Can this be done?

I have made stateless forms work when only selecting and updating one record at a time but im not sure how to do this with multiple records at once.

Im using this for a Batch Shipping Application. The idea is you can use the multi select field to choose the orders that have shipped together at the same time. You add the tracking info and click submit. I need the form to update all the selected orders with the tracking number and change the order status.  

Can this be done and could anyone offer some direction please and thanks!