Naming Labeling Pivot Fields

[Shailesh]

I have a Pivot Field and it has Column1 , Column2,
Column3,...................,Coulmn10 in columns.

My requirement is that I want to label / group
Column1-Colun5 as Column One
Column6-Colun8 as Column Two
Column9-Colun10 as Column Three

I want to do it so that once users select / unselect various fields
they should be aware of which group are they of?
Also these groups should intelligently collapse or expand when the
users bring down the page fields down in row field

Could any one please suggest any answer?I will really appreciate.

 

[Shailesh]

Also I would like to add that these newly created headings should move
along with the parent Pivot fields