Merging two time series data sets

Hi there,

I am struggle to merge two time series data sets. I know the combine dataset command but it doesn't work in my case as I have one dataset with flows of trade between countries (with the first row variables: Countryname, Indicator name, YR1960, YR1962...) and then one dataset with unemployment figures for each country (with first row variables: Countryname, Indicator name, YR1960, YR1962...). How could I merge both of them while keeping the results of unemployment and trade flows separated for each country in the same year.
Thank you very much!

John