Is there a way to show the number of slot left

I am building a form for people to signup their children for an event and have space for 40 total children.  Is there a way to show the number of spaces left (out of the 40) when someone launches the form?

Can you share to us the URL of your form so we can take a better look on what you were working on.

Perhaps you may want to consider using also the Appointment Slots widget.

You can test the demo form https://form.jotformpro.com/form/43352010062942

Let us know how it goes.