Embed webpart

There are two Embed webparts on the share point home page,

The left webpart, we set it as menu where html(aspx) has been inserted.

The right webpart, we want to realize that when the items(there are mutiple items) is clicked on the left webpart, the contents can be opened on the right hand.(different types, such PDF file and new page)

I am not sure if there two parts can be connected and above can be realized.