Ex-post reviews can be conducted either from a new holding (including generic) or a holding that has been converted from ex-ante research. For more information on how to create a comparison with ex-ante or ex-ante research, see here.
Navigate to the holding you would like to review:
Click into the Reviews tab:
Click New to create a review
Enter a Review name and Continue:
This will take you to the review screen:
For further information on Ex-Post Reviews, see article Ex-Post Reviews - Review Screen