Programming switchboards: How should the switchboard be programmed to separate the two telephone lines?

If the telephones are to be divided up equally for each home, the programming is as follows:

98 1234 41 2 R, 98 1234 42 2 R, 98 1234 43 2 R, 98 1234 44 2 R
These settings totally disable the urban line 2 on extensions 41, 42, 43 and 44.

98 1234 45 1 R, 98 1234 46 1 R, 98 1234 47 1 R, 98 1234 48 1 R
These settings totally disable the urban line 1 on extensions 45, 46, 47 and 48.