New bookmarks can be made by clicking on New bookmark in the top buttons on the bookmarks page or on the page of a specific bookmark.

Open the 3D viewer from the navigation menu.

Press the new bookmark button on the top right of the bookmarks page.

Move around in the model until you have the screen view you want to create a bookmark off and

When you are ready click on take snapshot.

If you want you can make a description of the bookmark that is optional and then you choose if the bookmark should be private or be visible for all members in the project. Then press the create button, and the bookmark is created.

You can choose to share or not your "private bookmark / share with the project"

You have two options: either to always "follow the latest revision" of your selected models or to permanently lock the bookmark to these current revisions "Lock to original revisions".