A method performed by a first node in a wireless communication system is provided. The method includes receiving, from a first terminal via a second node, a protocol data unit (PDU) session setup request message, obtaining, from a third node and a fourth node, group information and subgroup information, in which the group information includes a list of a plurality of subgroups and the subgroup information includes quality of service (QoS) information for each of subgroups, transmitting, to a fifth node, a traffic forwarding setup request message including the group information and subgroup information, and transmitting, to the first terminal, a PDU session setup response message including the group information and the subgroup information.