Creating partials from a page and navbar question

If I create a page in nodejs am I able to later turn part of it into a layout and the body into content pages or do I need to plan that out first.

And secondly are the BS4 Navigation components in wappler not really working? Specifically, the Brand component seems to not allow the ability to change the text of that element or completely replace it with a logo. Am I better building a navbar from scratch because this is unreliable?