Concatenate multiple Scope of Running Value in SSRS

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I have an expression like this

Doc_No      Category    Material    Rev0    Rev1    Rev2...  Total 
 
1          A              xxx        2      3       0        2+3+0=5 
                          yyy        0     20       0        0+20+0=20 
           G              xxx       -1      1       0       -1+1+0=0 
                          yyy       10     12      23       10+12+23 =45

Here i want to display one more column for total values ...

for this i'm using RunningValues, but In that i want to Concatenate Doc_no, Category,Material..

=RunningValue(Fields!Material_Quantity.Value,sum,"Doc_No")

here Doc_No is column value , based upon doc_no total quantity is displayed upto now.
But i want to bind the scope values more than 1 , how to do ...

Ex:

now the scope value is ---- "Doc_No"

but i want to bind more than one value
like ---- "Doc_No + Category...."


How to achieve this...

Any one help me regarding this issue...