Regarding multiple DSO to single DSO

I have loaded data to 2 dso's., In one DSO1 i have Cust num, Cust age and in another DSO2 i have Cust num, Cust address, Cust contact #., From these two DSO1, DSO2 have to load to DSO3 of final one on the top of the two DSO'S.

Whats the Procedure like how loading happens to Final DSO., Whether have to map anything at DTP'S.

Because at FInal output of DSO3, i need a single record of Cust num, Cust age, Cust address, Cust contact #.

Can anyone help me or guide me out.

Thanks in advance.