code: public function addSubProcedure(FilterBuilderSql $subProcedure)
      {
          $this->procedures[] = $subProcedure->getProcedure();
          $this->parameter    = array_merge($this->parameter, $subProcedure->getParameters());
  
          return $this;
      }
docs: Add a sub procedure.
  
  @param FilterBuilderSql $subProcedure The sub procedure to add.
  
  @return FilterBuilderSql