Dear Student,
The picture you have uploaded is not clear.
but for your information, in order to convert the three- dimensional structure into fisher
The group below the plane (the dashed lined) is written at the bottom of the vertical line.
The group above the place (the solid lined) is written at the top of the vertical line.
The groups in the plane are written on the horizontal line in the same fashion as on the solid-wedge formula.
Please see further at following link
https://www.askiitians.com/iit-jee-isomerism/fischer-projections-exchange-method/