Hi,
Here is the documentation which you can start with:
c:\NXP\S32DS_Power_v2.1\S32DS\software\S32_SDK_S32PA_RTM_3.0.3\doc\S32SDK_MPC5746R_UserManual.pdf
See section 14.3.4 Hello World MPC5746R.
If you need more details for those steps, take a look at quick start guide or to user guide:
c:\NXP\S32DS_Power_v2.1\S32DS\software\S32_SDK_S32PA_RTM_3.0.3\doc\S32SDKQSG_PowerArchitecture.pdf
c:\NXP\S32DS_Power_v2.1\S32DS\help\pdf\S32DS_PA_User_Guide.pdf
Regards,
Lukas