corps attachment

[hmstanley]

I'm a bit confused about corps attachment and how it works.

I have two detached units in the Tata scenario for Budapest 45.  They belong to the 52 Pioneer brigade, but they are not attached to any HQ in the scenario, based on the fact that their unit title is yellow.  That said, the scenario indicates that I have a corps attachment available and I'm not sure what this means exactly? 

• Does this mean I need to attach those detached units to a "on the field" HQ? and if so, I can't seem to even figure out how to do this? 
  

• Does this mean I can attach the higher HQ, in this case, IV Pzr corps, to another higher HQ? 
  

• What exactly am I doing here? 
  

What does this mean when I have this "corps attachment" available and how do I use it effectively?  

That is my basic question, as I'm looking at the "Corps attachment" dialogue and I have no idea what I'm supposed to do?

Thanks,