Copy multiselect dropdown values using process definition update field event

Hi All,

I have same multiselect dropdown in document and opportunity with below values and when user create record from document module subpanel in  opportunity  record view then I want to copy the same values to opportunity module using process definition:

  • Choice 1
  • Choice 2
  • Choice 3

Case 1:If user select

  • Choice 1  then update Choice 1 in multiselect dropdown of opportunity

Case 2:If user select

  • Choice 2  then update Choice 2 in multiselect dropdown of opportunity

Case 3:If user select

  • Choice 3  then update Choice 3 in multiselect dropdown of opportunity

Case 4:If user select

  • Choice 1 & Choice 2  then update Choice 1 & Choice 2 in multiselect dropdown of opportunity

Case 5:If user select

  • Choice 2 & Choice 3  then update Choice 2 & Choice 3 in multiselect dropdown of opportunity

Case 6:If user select

  • Choice 1 & Choice 3  then update Choice 1 & Choice 3 in multiselect dropdown of opportunity

 

How to achieve above using process definition update field event. 

Kindest Regards,
Shreya