Q.How to train Jasmin Sambac on a wall fence?
In our garden, we have planted 10 jasmin sambac plants near the wall which is 120 cm . We would like to have the wall covered by the jasmin plants in time. Currently, some of the branches of the jasmin plants are connected with a string to the wall as seen in the picture. Is this enough? Or is a string net necessary like the one in the attachments?

You will need to attach the vines to a trellis placed against the wall.
Cut long strips of soft, stretchy cloth with scissors. The cloth should be the same color as the stems so the ties blend into the plant, making them less noticeable. Because the bush varieties of jasmine plants are not self-supporting, they will need to be tied to the trellis.
Weave the growing stems in and out of the gaps in the trellis. Wrap the stems around the trellis bars in the same direction that the stems grow in. Encircle a stem with a tie and loosely knot the cloth. Do not pull the knot so tight that it cuts into the stem.
Knot the cloth to the trellis at the proper height. The first knot will add a cushion between the stem and trellis. Keep tying the stems to the trellis until they are all secured. As the stems grow longer, add more ties until the top of the trellis is reached.
https://www.gardeningknowhow.com/ornamental/flowers/jasmine/growing-jasmine-plants.htm