Set of Approvals in Workflow

Hi everyone,

     For Workflow, I need set of Approvals. Ex: If building(tableField)='A' all users i choosed(ex: userA, userA1, userA3) will approve(depends on condition I have added in Approval), If building =='B' users(userB,userB1,userB2) will approve and so on 'C',;D'.....  I need to add many approval ? Or Is there any way? How to create workflow for this?