This is typical for the P4 GUI (old and new) - it can do lots of things, if only you knew where to look (hint: usually not where you'd expect to find it).
There IS an option in P4V similar to the old 'Add Files to client view' from P4Win, only a lot more powerful! (it's a bit hidden and IMO not as streamlined as the original)
You can't find it in the depot view, where you probably ARE when you need it. Instead, go to Workspaces view, right-click the workspace definition and 'Edit' it (or dbl-click it then click 'Edit').
Notice the tabs on top of the 'Workspace editor' window that just opened. Select the 'View' tab. There is a lot going on here, including (apparently) information on the new 'Offline' mode.
To get to the point: in this window, find the piece of depot you need and right-click it.
Nirvana! There are no less than 6 menu options (!) that allow you to specify how and what to add OR remove to/from the workspace definition.
There's even an 'advanced' mode that looks a bit scary :-&