How do I create all the Navbar components, e.g. Navbar Brand#, Navebar Toggle, Navebar Collapse, Nav Item? Do I just repurpose what is there?
Not sure what you mean by “repurpose.”
The Bootstrap Navbar component incorporations the Brand#, Toggle Collapse, Nav Items, etc… as per the Bootstrap framework (these are all just pieces of CSS code.)
Bootstrap Studio follows the official Bootstrap framework, so you won’t find these available as separate drag-and-drop components. But there’s nothing stopping you from placing a Navbar on your page and then deconstructing/copying/deleting the individual parts.