@Randy B. Singer , that isn't exactly what the OP was asking..
@jsteave - If you trying to replicate website, just inspect the code and look at the HTML structure to see how they are doing it.
The rigid idea of grids are no longer actively used. Bootstrap, for a while, was the go-to standard and put everything in grids when people tended to write their code largely in XHTML and CSS. These days, people tend to write code from the various frameworks out, React, Angular and so on and they've all adopted the component style of coding.
So you write up your components, put it together at the Index level and then use SCCS to structure the overall page.
Additionally, with the grid system you end up getting a pretty rigid design, and with components you can add/remove pieces, so grids don't make a lot of sense.
Lastly, if you are looking to put things into Figma, the idea is not to worry about the specifics of how a website is going to be built, but rather how you want to display the information and deal with the interactions. Putting grids into Figma is unnecessary.