Add Additional DAE to an existing DPE for AX4-5i

Hello Team,

We are planning to upgrade our EMC Ax4 storage array(Dell) with additional capacity. We have to add another DAE to the DPE, we have all the ports and necessary cables ready. I came to know that we need "expansiontier" license to visible the upgraded capacity on Managment Console. Can someone please let me know the process to add DAE to a DPE for AX4-5i