Display the same data and summation in mysql : I want to ask and hopefully the readers can help.

I have a case showing data details based on order number.
the following data.

+ order number | item | total kg<br>
1. 99684 | CF Rice Pandan Wangi 10 kg | 50.0 kg<br>
2. 99684 | CF Rice Rojolele 10 kg | 100.0 kg<br>
3. JK14020 | CF Rice Pandan Wangi 10 kg | 20.0 kg

I would like if if there is the same name it only appears 1x and its total kg increases also according to the total details per each of them, is there any solution for this?

I just use looping without any condition, do not know how.