Can we add multiple value in one parameter by selecting value of other concurrent request

Dear all,

I want to pass multiple values in one concurrent program , suppose I have two parameters A AND B and I want to assign A value to parameter B, then choose another value from parameter A and

it must assign to PARAMETER B. ie.

Parameter   A  LOV choose value  "1"  , it is assign to PARAMETER B=1

then next again CHOOSE ANOTHER VALUE FROM PARAMETER A VALUE "2" AND it must assign to parameter B=1,2

Is it possible?

Thanks