Creating a sports registration form, is there a way a parent can register multiple kids on the same form?

Want a way to create a form, where the parent can register multiple kids and when done make one payment instead of multiple payments?

You can just create multiple fields and use the "Page Break" tool. The Page Break tool allows you to create multiple pages. Here's a guide: How-to-Create-Multi-Page-Forms.

You may also use the "Section Collapse" tool. This allows you to split the form into sections.

Here's how the Section Collapse work:

Lastly, you might want to check the Configurable List widget. Here's a guide: How-to-Set-Up-the-Configurable-List-Widget.

Related guides:
Show-or-Hide-Multiple-Fields-at-Once-Using-the-Form-Collapse-Tool
How-to-Skip-Pages-Using-Conditional-Logic

Hope that helps. Thank you.