Multiple PPTP users with different IP range

I've checked this out.

So, if i want to add more users to connect with different user ID,

this is the solution.

But what if i want set a different users with different IP address?

here is an example.

# user 1
ID : user 1
PW : user1
ip range :

# user 2
ID : user 2
PW : user2
ip range :

Any solutions?