Define variable subject to decision variable binary

Hello,

I have a binary decision variable dvar boolean X , an integer variable dvar int  bu  and  dvar int+ zh;

  X [] = {<1 1 1> <1 1 2> <1 1 3> <1 1 4> <1 1 5> <1 2 1> <1 2 2>
                        <1 2 3> <1 2 4> <1 2 5> <1 3 1> <1 3 2> <1 3 3>
                       <1 3 4> <1 3 5> <1 4 1> <1 4 2> <1 4 3> <1 4 4>
                       <1 4 5> <1 5 1> <1 5 2> <1 5 3> <1 5 4> <1 5 5>

                       <2 1 1>}

I have a restriction like this:

subject to{

 forall (h in 1..2, c in res[h] )  
          bu[] >=  sum(u in res[h]) x[] ) – 1 ; 

 forall (h in 1..2)  

      zh[h] >= maxl( c in res[h]) bu[] ;

}

 variable bu give me:   bu = [0 -1 -1 1 1 0];  that is correct.

But I I would like to know if it is possible to add the values in c, to get something like this:   bu = [0 -1 -2 -1 0 0 ]

Regards.