Database Multi Update

Hi
I have a master detail page . The master contains one record which is an event on the top half of the page. This contains the event title etc. The second half of the page is a Bootstap5 table and shows indivdual users allocated to this event (1 user per row). The rows have a dropdown which can change the status of each user.

I want to then have a button at the bottom of the form which would save the updated user data to the Db. I assumed I would use a Database Multi update action. I can’t find much inforamtion on this action I notice it creates a repeat and an update action. I notice it also creates an array called record. I can’t work out how this array gets populated from the bootstrap table. Do I need to create a further action to update the array or does it do it dynamically. I tried to create an array but I couldn’t find how to access the cells within the Bootstrap table?

I can’t seem to find any tutorials on this subject

Many thanks
Dave