The 4000T is a bit strange because of the true scsi and ide headers.
Also, the workbench.lib was removed from rom
So, if your are using a true scsi drive, and your are using the real 4000T install set...
It's just a matter of setting the partition you want as bootable (as already shared)
Same is true of the ide drive but usually you have to cold boot, the drive light will seem to hang, wait a second and then just soft reset and it should find the ide partition.
M