Hello Vinn,
If I understand you questions correctly:
_1. You can't go directly from a group of Surfaces to a Solid.
You need a Volume to create a Solid from a closed set of geometry.
Use the LIMIT2/FACE function to create Faces on your Surfaces.
The Faces must fully cover the outer surface of your desired Solid and share common boundries, no gaps or overlaps.
While still in the LIMIT2 function, select VOLUME. Select a Face and then the 'AUTO SELECT' box.
Watch *VOL1 magically appear.
Finally, invoke the function: SOLIDE/CREATE/COMPLEX/VOLUME and select *VOL1.
Now, if the stars are properly aligned and you are using V4, a new *SOL will suddenly manifest itself.
( If it didn't, double check those pesky Faces)
_2. You can pick everything, of the same color, in the current workspace by typing
*COLx (x= the numerical value of the color). example: *COL5 = Yellow
-or-
You can pick every Yellow Surface by keying:
*COL5&*SUR
Hope this has helped.
Chaplain