Two file of data

#1
Hello,

I have two files, one is data for the population and one is the data for the sample.
All the participants in the sample exists in the population.
Can I put the population file and the sample file in one SPSS file even though the number of records in both are different?
Both files have key_number , and all the key_numbers in the sample are existing in the population.

Thank you
Sima