Combine one page site with regular menu

Hi, I would like to reproduce this website (https://valitek.ca) but with GRIDBOX. Notice that a few menu items like the Valitek logo and "PRODUITS" are in one page mode, scrolling to sections in the home page. And you have menu items like "NOS TARIFS" that points to a PDF file and the "Support TeamViewer" submenu items point to a download URL.

Can you please explain to me in details how can I successfully reproduce this?

Thanks in advance for your precious help.

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