Sanderxpander
If you exported all your WAVs at 48KHz there are no other steps needed, you can just drag them in there all at once (or use the import dialog). Doing it one by one has no benefit that I can think of.

Yeah well, never thought of that at the time.
 

soens
So how do you "make sure" the new project is 48/24?

First up I set the Octa-capture to 48/24.
I then started a new project and I noticed that the "new project" template menu actually was defaulted to 48/24.
I had never noticed that before, though I've used it hundreds of times before.
Next, when the GUI opened, there it was, set to 48/24.
The converted 48/24 individual wav. files then just snapped in.

c5_convertible

soens
OAN, Since MS has removed all the nice file attributes for audio files since Windows 7 , the only way I've been able to tell a file's bit rate and depth is to install MediaTab.

That's not entirely true... These attributes are still available, and can be made visible in the standard explorer. Go to your files, and right-click on the title bar (where it says Name, Date modified and so on). Click more, and you will see a list of all attributes you can select. Bit depth and bit rate are available there. If you select them, they will show up.
If you want to not always select this route, you can save that. Once you made the attributes available, click on the view tab in explorer (w8 and W10), click the options button, click change folder and search options. In the new window, click view, then click apply to folders, and finally click yes.
So, no need to install extra software :)

Well, "That's not entirely true..." either. I know I said "bit depth and rate" but I meant "bit depth and sample rate".
 
Here's how Windows 7 & 10 show these File Attributes when Details is selected for wav, mp3, & wma files:
 
Bit depth - (blank)
[nothing there. might as well not be in the list. probably an oversight when removing the rest]
 
Bit rate - (xxxkbps)
[Sample rate and bit depth can be extrapolated from this if you have a conversion chart]
 
Sample rate - (not in the list)
 
In Windows XP and prior these were all available. When I moved to Windows 7 they were no longer there.
 
The only place within Windows I can find any reference to a file's sample rate is in Media Player under File - Properties, and then only for wma files, not wav or mp3 files.
 
When searching the web to find why I found many people complaining about the same thing. One web site gave MediaTab as a solution. I would rather be able to see this data at a glance in Folder Details like before but this is something anyway.