There will be a load file for the DEcserver somewhere on the current system. You need to move that to the corresponding directory on the new system. You may then need to configure the DECserver as a MOP client or use LANCP. Since you don't say what your current load server is or what the new one is, it is difficult to give precise instructions. VMS versions? DECnet versions?
The load file is likely to be in MOM$LOAD and be called something.SYS You need to identify this file and copy it to the Alpha. Depending on what version of DECnet you are using on the VAX you may be able do just do a cut and paste of the contents of SYS$MANAGER:NET$MOP_CLIENT_STARTUP.NCL onto the Alpha (assuming you have enabled MOP on the Alpha).
There's no NET$CONFIGURE ADVANCED, but there's a NET$CONFIGURE.COM, when I run it, it asks me: Enter the directory services to use on the system{DECDns,Local,Domain].
