@maya1234 Assuming you have two datasets: the given dataset named "Have" and your dataset called "MyOwn". Also assuming you want to vertically stack the datasets (a process called concatenation) and both datasets have same named columns/variables. Then using simple code as below you can concatenate them.
DATA Merged;
SET Have MyOwn;
RUN;
However if you want to merge them or you want to edit the table, the answer would be different.