Multiple Line Entries with one Form Submission

I also need this for creating a Mileage Reimbursement form that allows users to enter a month's worth of trips. Currently we use another solution but wanted to migrate it to Smart Sheet. The other solution uses arrays so you can fill out the trip information, then add a new row for each trip until the end then Submit. It also does the calculations for the entire form, which then is automatically sent to Accounts Payable.

The same thing for Petty Cash, with rows for each expense item.

We need a form feature in which multiple lines can be created by one form. For example, I work for a large school district and we need to collect fieldtrip information from 150+ schools. Some schools might have 1 trip and some might have a dozen. I want an admin to be able to enter all trips on one form - entering a form 10 times means entering contact info and site info 10x.

In the above example it would ideal for single form entry to translate into 10 line items on a smartsheet grid.

Thanks!