Want to make holes through 3d object

[Henrik Helle Vindenes]

Just what the title says, I want to make 3 holes, through this object to stand in style with the rest of the object.
Here is the object

Here is the object with markers showing the holes and lines showing the direction the holes should extend through.

So, I'm very new to this whole 3D thing in Photoshop and I am not going to do a lot of this so I really don't want to start learning a whole new program to do this

Anyone wanna point me in the correct direction? :*

 

[MrToM]

What PS version?

Regards.
MrToM.

 

[Henrik Helle Vindenes]

Versior: Cs5, 20150722.r.168

 

[MrToM]

See if this helps:

https://forums.adobe.com/thread/841710?tstart=0

Regards.
MrToM.

 

[Henrik Helle Vindenes]

I just read this, but it was not very helpfull. I may have misswrote about the 3D part. I am not using the 3D built-in tools of Photoshop. I am simply drawing the object in 3D, but when it came to making these holes. I got stuck :/