Hi Narendra,
You will perform database migration from MaxDB to HANA, not ECC upgrade, right? If this is the case, you can use heterogeneous system copy export/import method. The primary application server and ASCS (called central instance before) are installed during migration. For additional application server (called dialog instance before), you can installed them later by using SWPM.
For load balancing logon, please configure logon group for server 1, server 2 and server 3 as server 4 is used only for background processing. For how to configure logon group, please refer to Configure and use logon group (ABAP) - Basis Corner - SCN Wiki
Regards,
Ning