How permit part of the url access?

How to permit part of the url accessed by only few IP addresses using data group and part of the same url accessed by all?

 

for example

 

http://example.something.com/Part_one should be accessed only by 3 ip addresses (datagroup) and

 

http://example.something.com/Part_one/Part_all should be accessed by everybody?

 

 

Thanks,

 

PK.