is there any api to set workflow activity to a particular user.

Hi @SB_10904295, 

Thank you for your question. 
I’d like to recommend to bring more details and context to your initial inquiry. 

It also helps to have screenshot(s) to better understand what you are trying to do in your process. 

This will increase your chances to receive meaningful help from other Community members. 

Regards,

Vivek N

Community Moderation Team