importing limited set of rows/tuples

Hi All,

I have eliminated certain tables while exporting as  the size of the data in the tables are huge.Though am having the schema which contains all the tables.
 
Now I want to import limited set of records/rows ( 1000 tuples ) from the eliminated tables.
 
Is this possible? If yes, please tell me how to accomplish this?
 
Secondly, like to know how postgresql take care of all the constraints/referential integrity while importing the records from the different tables?

Cheers,
Cha