Now I'm curious. Were you able to modify props' characteristics on the right side before this latest rendition of CC?

As far as I can remember,
you couldn't see any props at all in CC 1 + 2
import. (I'm actually pretty sure)
There were also none in CC 1 + 2.
This has only been available since CC 3.(that's why all props are iProps, since there are no ccProps)
But you can already change the props:
Visible if you insert a different texture in base color
(Substance is not possible)
You can also use substance texture if you want to use Iray. Drag and drop the substance file onto the prop) If you render it with the IRay plug-in it has taken on the substance texture)
Greetings from Germany
Postfrosch

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I believe 4u2ges already helped. He is in an earlier timezone...:P

The trick to use props before CC3 was to have them as accessory, which is a prop attached to a character. And you can modify those, just like a prop.

As mentioned, in CC3 props were introduced, so you don't need this workaround anymore.

But I just checked and the original accessories are still there (under Accessories/Other). And you can use the Appearance Editor on them.

BTW, did you install the available Resource and Bonus packs for CC3? 

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But I just checked and the original accessories are still there (under Accessories/Other). And you can use the Appearance Editor on them

I did not have them either as OP. I had to copy/paste from CC 2 installation. I know why though. My CC3 has different path for templates than CC2.

Interesting fact/bug/omission about attaching props. You cannot attach them to avatars in CC 3. There is no context menu. But there is a link "Attach" in the "Edit" menu. Attach what?
When prop on the stage is selected, the Attach is grayed out. When characters' accessory is selected, Attach becomes available :Whistling: Should not it be the other way around?
Otherwise I do not understand what it is for...

Update
OK, I figured it out. You use Attach is you want to reattach accessory to a different bone. But I do not see the point. You have an attach section under any accessory where you map to bones....

I remember now: When installing CC3 there was the option during installation to copy CC1/2 assets over. That must be why I have them.

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animagic I had to manually place the .ccAcc files that 4u2ges hooked my up with. That said, there is one big question mark. After initially installing everything, I realized that it took up too much space on my solid-state HD on C:, so I tried to move everything over to D:. It was tedious, and I thought I got it all. However, I decided I wasn't sure, so I uninstalled *everything*, and re-installed on D:. I have found that after that, I still had to uninstall some packages in Smart Gallery because I would right click > View Items and they'd all be blank. 
So I uninstalled them and reinstalled them in the Gallery and it was ok then. 
I do believe I got them all, but I'm thinking it is the most likely answer at this point.