MSP432E401Y: Sinusoidal PWM from PK4 pin

I hope I understand you. Are you trying to generate a variable duty-cycle PWM that will produce a sine wave after running through a RC filter? We don't have such an example. You will need to write your own code for this. You can refer to this app note or search online and I'm sure you will come across examples or ideas on how to do it. 

https://www.ti.com/lit/pdf/spna217