Splitting a portfolio page into multiple pages

Site URL: https://www.betterhomessiding.com/

Hello, I've recently been helping maintain the website https://www.betterhomessiding.com/ and the portfolio page feels incredibly image heavy and long. I'd like to have only 40-50 images, then the option to "see more" on additional pages. Something like how product pages will have multiple page options at the bottom instead of everything automatically being dumped on a single page. Is there a way to easily do this? My searches through the forums haven't panned out so I may not be wording my search correctly. Thanks in advance!

I've just built a large website (for a first timer) and some pages got too big. The only way I could split one big page into two smaller pages was to duplicate the pages (see in the page settings) and then delete out of both of them. A crude process that could be made a LOT easier if we could delete and also copy multiple blocks at one time. Good luck!