You can do this simply by replacing the default "Type 109 - TMY2" with a Type 99 (Weather data reading and processing -> User format).
The advantage is that Type 99 processes the solar radiation the same way as Type 109 and has the same output.
Moreover, when the Type 99 is put in the Studio, there is an example file in "External files" tab, and you can just adapt it.
Subject: [TRNSYS-users] question about user weather data file
> dear trnsys users,
>
> I am trying to simulate the energy consumption of a building in my
> city.
> Unfortunately trnsys does not have a weather file for my city, and I
> do not want to use meteonorm tmy2 generated file.
> I want to create my own weather file with the data recorded at our
> weather station.
>
> Could someone please tell me the easiest way to simulate my building
> with my data file?
>
> And how do I create the data file in such way that trnsys will
> recognize it? (which software?)
>
> I read about type9 and type16 but I am not sure that is the best way.
>
> Thank you,
> Serban Cristina
>
>