Hi, There is a solution, it needs to make some custom code work. There is link option in Image Format Post, you paste the page’s url into the link option, the Portfolio module could list the Image Format Post, click it, it will transfer link to the page what you paste into the link option of Image Format Post. It need to change the /modules/portfolio.php of BM-pagebuilder plugin.
If you think the solution is ok, I’ll tell you how to change it. Please let me know which type of Portfolio you want to use also.