Hi Leo,
If the existing project example is intended to GCC build tools, there is no easy way to migrate into IAR.
In order to be able to migrate such a project from S32DS->IAR the project has to be created for IAR toolchain.
So I'm affraid the only way is to install the IAR Eclipse plugin and create a new project for IAR toolchain and then
transfer all the source files/ SDK configuration into this new project.
Hope it helps.
Stan